The impact of the war in Ukraine on the perinatal period: Perinatal mental health for refugee women (pmh-rw) protocol

Background The aim of the Perinatal Mental Health for Refugee Women (PMH-RW) Project is to investigate the impact of the war on perinatal mental health: anxiety, post-traumatic stress, depression, and birth trauma symptoms. It will also evaluate the factors that serve as protective elements for the development of these potential diagnoses (such as personality traits, social support, sociodemographic characteristics, and access to medical/mental health services). Method An international observational cohort study with baseline data is being assessed in Ukraine (for internal refugees) and several European Countries (for external refugees). The study includes as participants both pregnant women and those who have recently given birth (with babies up to 1 year old). The assessment includes measures on depression (EPDS), anxiety (GAD-7), experiences during birth (City Birth Questionnaire), post-traumatic stress symptoms [Impact of events scale—revised (PTSD-R)], Personality (10-Item Personality Inventory-TIPI), and a questionnaire for socio-demographic data which also such social support. Conclusion This study will provide needed information for determining the impact of the Ukrainian Crisis on perinatal mental health by studying potential risk and protective factors. The data collected will be used to inform policymakers with useful information that can be used in the development of plans to protect and promote the mental health of the perinatal refugees impacted by this event. Also, it is our hope that data collected from this study will serve to plant the seeds for further research regarding the impact of the crisis in Ukraine on the offspring and to analyze how these events are affecting further generations. Clinical Trial Registration ClinicalTrials.gov, Identifier: NCT05654987.


Introduction
United Nations Population Fund (UNFPA. Ukraine. Conflict compounds the vulnerabilites of women and girls, 2020), estimated that about 265,000 Ukrainian women were pregnant when the war broke out in February 2022. Eighty thousand women were expected to give birth in the subsequent 3 months in Ukraine or abroad (UNFPA. Ukraine. Conflict compounds the vulnerabilites of women and girls, 2020). The current migratory situation in Ukraine varies. The number of women fleeing the country, returning to Ukraine, and remaining in Ukraine even though the ongoing hostilities is difficult to estimate. However, it can be concluded that many Ukrainian women have experienced and will experience stress and/or possible adverse consequences (or trauma) related to the war and forced migration (Ancheva and Morozova, 2016;Zhabchenko et al., 2018;Romanenko, 2020).
To examine and suggest the most effective practices that may reduce the psychological effects of war refugee status on women, members of the "Research Innovation and Sustainable Pan-European Network in Peripartum Depression Disorder-Riseup-PPD" (Cost Action 18138), funded by the European Cooperation in Science and Technology (COST), established the "Perinatal Mental Health and War Refugees status" group.
Even in non-war conditions, the perinatal period (from pregnancy to the first year after the baby is born) is a vulnerable time per se. It is estimated that 1 in 5 women will develop a perinatal mental disorder, which implies that the onset and recurrence of mental health disorders during this period is very high (Andersen et al., 2012;Soto-Balbuena et al., 2018Fawcett et al., 2019;Legazpi et al., 2022a,b). Depression, posttraumatic stress disorder (PTSD), and anxiety are shown on the literature as the most recurrent diagnoses (Chrzan-Dętkoś et al., 2022). The consequences of war and migration can be particularly damaging for mothers and babies. Studies have shown that the trauma of war or moving to a new area can have long-term negative effects on mental health, leading to an increased risk of depression and post-traumatic stress disorder (PTSD; Hoppen and Morina, 2019;Hoppen et al., 2021).
Mental health professionals who specialize in working with refugees have identified pregnant women and recent mothers as particularly vulnerable members of the migrant community because they are "in a precarious situation in a foreign country, when the sense of inner homelessness can easily develop, and the capacity for empathy and intuitive parenting can be weakened" (Utari-Witt, Walter, 2021, p. 58). For example, a study carried out in war-affected Syria indicated a high percentage (28.2%) of women is at high risk for postpartum depression (Roumieh et al., 2019).
It is also important to note that experiencing war can increase the chances of having a difficult pregnancy and delivery, as well as negative experiences related to childbirth (Fatusic et al., 2005;Arnetz et al., 2013). Along the same lines, exposure to armed conflict can lead to premature birth and babies with low birth weight (Fatusic et al., 2005;Davis and Sandman, 2010;Keasley et al., 2017). However, the likelihood of premature births, stillbirths, and miscarriages increases when there is direct exposure to conflict. For instance, the negative effects often stem from being exposed to a toxic environment with pollutants, radiation, exhaust fumes, or even water or food that has been contaminated in a war zone (Arnetz et al., 2013). Additionally, emerging research has found that women who fled from the Ukraine war experience significant changes in their status, including a loss of a previous lifestyle, daily contact with friends and relatives, financial losses, changes in perinatal health care associated with limited access to health care, and difficulties in finding a health professional (doctor or midwife) that meets all the medical needs (Chrzan-Dętkoś et al., 2022). Additionally, these women report having limited social support (lack of friends, relatives) and live in isolation as a result of being an immigrant (external refugee); research has found that lack of social support (perceived or actual) is a significant risk factor for developing several mental illnesses during the perinatal period (Marcos-Nájera et al., 2020. Another risk factor for mental health is the individual adaptation to a new life in the host country. Heslehurst et al. (2018) reported daily difficulties faced by immigrants and asylum seekers in the host country: not knowing the language and being unfamiliar with the local lifestyle and health practices can create additional burdens and risks for mental and general health. Systematic reviews report that perinatal outcomes such as mental health, maternal mortality, preterm birth and congenital anomalies are predominantly more severe among migrant women (Falah-Hassani et al., 2015: Heslehurst et al., 2018. In a German study, 87.4% of the pre-and postpartum migrants were affected by medical complications or high-risk pregnancies (Kaufmann et al., 2022). However, these studies often do not distinguish among the different statuses of migrant (refugee vs. immigrant) populations, and host countries that may significantly differ regarding the organization of access to support and health care services. For example, an Australian study (Snow et al., 2021) showed elevated psychosocial risk factors among women of refugee background compared with Australia born-women, with the possible under-reporting of mental health problems and family violence. Research on healthcare for pre-, peri-and postpartum refugee women in highincome countries has shown that their access to health care is hampered by immigration experiences, insufficient health literacy, poor language skills, insufficient perception of health needs and use of health services, and legal restrictions (Haith-Cooper and Bradshaw, 2013;Rizkalla et al., 2020). These results raise questions regarding assessing psychosocial risk within different cultural groups and show the importance of the culturesensitive approach to women with different cultural backgrounds. A systematic review and meta-analysis showed that the prevalence of current PTSD among migrants exposed to armed conflict is 31%, the current major depressive disorder is 25%, and the prevalence of generalized anxiety disorder is 14% (Mesa-Vieira et al., 2022). Migrating to a middle-income or low-income country was associated with an increased prevalence of generalized anxiety disorder-however, evidence is still scarce (Fellmeth et al., 2018).
Pre-migration experiences, migration and experiencing perinatal complications can profoundly impact the lives and mental health of both mother and child and have also been shown to have long-term effects on the mother-child relationship (Graignic-Philippe et al., 2014), day-to-day functioning as well as interpersonal relationships and past traumas (Fellmeth et al., 2018) Protecting and monitoring perinatal mental health in response to the war crisis in Ukraine is crucial (Sacchi, 2022). Focusing on helping this target group of refugees also gives the possibility to reduce the health costs associated with poor perinatal health, such as depression and prevent child development and intergenerational transmission of adversity and trauma. Determining factors that increase the likelihood of developing PPD, anxiety and PTSD in war affected population could help identify women at risk and improve efforts at prevention and early detection. In non-war and forced migration condition, personality traits such as neuroticism (Puyané et al., 2022), perfectionism (Gelabert et al., 2012), poor social support and a personal history of psychopathology (Robertson et al., 2004) are well established risk factors for perinatal mental health disorders-however, not much is known about their role in war affected population. Generally, research indicates that many factors associated with perinatal depression are more context-specific and vary according to culture (Fellmeth et al., 2018). It is essential to carry out more thorough investigations to evaluate the psychological distress of women, as well as the potential risks and protective factors in varied contexts (internal vs. external refugee) that have emerged due to war, in order to lay a reliable foundation for comprehending the effect of war on women's mental health during pregnancy.
As Chrzan-Dętkoś et al. (2022) has pointed out, more research should focus on different topics (e.g., risk and protective factors for the perinatal mental health status). The first necessary step should be to develop a comprehensive definition of psychological distress in this target group. Depression and anxiety are the most prevalent psychological diseases in the perinatal period, but PTSD is also an important disorder related to the impact of war and migration (Andersen et al., 2012;Hahn-Holbrook et al., 2017;Shorey et al., 2018;Fawcett et al., 2019). Conducting more research regarding the prevalence and prevention of mental health disorders during the perinatal period is essential. Not only it would benefit the implementation of prevention interventions to support mothers during pregnancy, but also it can have a very positive impact on the offspring (Caparros-Gonzalez et al., 2021). As Tuovinen et al. (2020) state maternal depression and anxiety are strongly related to an increase in inflammatory biomarkers in the mother during pregnancy. These increased numbers of biomarkers are associated with a higher risk of neurodevelopment delay in the offspring. Although fetal programming hypothesis is still under research and results show as inconsistent, there is a valuable truth that can be removed from it: that mothers and babies are interconnected, and that taking care of one implies taking care of the other.
The war in Ukraine brings new challenges to primary care and mental health services all over Europe. We focus on perinatal mental health, and to our knowledge, no previous studies have been conducted to study the impact of war in this field. Although for most European citizens, the date of the war outburst is 24 February 2022, the war in Ukraine, with all the consequences for the civil population, including pregnant and postpartum women, started in 2014. A study conducted in 2016 (Ancheva and Morozova, 2016) demonstrated PTSD frequency in 34.8% of pregnant women displaced internally. Another study showed an increased risk of reactive and personal anxiety, depressive manifestations, autonomic dysfunction, insomnia (Romanenko, 2020), and the risk of premature termination of pregnancy among war-affected population (Cox et al., 1987;Romanenko, 2020). Pregnant women who have been forced to relocate within their own country display a high amount of both reactive and personal anxiety. In pregnant women who were internally displaced, reactive anxiety was 3.3 times higher, and personal anxiety was 2.6 times higher than in pregnant women who were not internally displaced (Zhabchenko et al., 2018). However, to date, there are no publications on changes in the mental health of pregnant women and mothers of newborn children during the full-scale war in Ukraine. The research team intends to launch an international longitudinal study in order to address the lack of knowledge on the consequences of the war and the status of war refugees on maternal mental health during pregnancy. This article outlines the design of the study.

Aim
The purpose of this upcoming research is to explore how the situation of war in Ukraine may be affecting perinatal mental health, such a anxiety, post-traumatic stress, depression, and birth trauma symptoms.

Symptoms
Another objective is to evaluate possible risk and protective factors (including social and economic factors, personality traits, social support, and access to medical/mental health services). We are focusing on the two groups of women who were affected by war during pregnancy: those who left Ukraine and are now refugees in other European countries (known as external refugees) and those who chose to remain in Ukraine (in the same place of residence, considered as internal refugees).
The main goals are the following: 1. To evaluate how perinatal mental health has been affected during the war, by observing the differences in (a) levels of depression, anxiety, post-traumatic stress disorder, and birth trauma; as well as in (b) clinical risk indices (proportion of women above the clinical cut-off point on a validated selfreport scale) 2. To research which risk and protective factors have a bearing on perinatal mental health during the war. 3. To examine the links between pregnancy results and mental health of women in war-affected areas. 4. To examine the experiences during the birth and delivery, specifically the potential traumatic events during this period. 5. To assess the perinatal women's needs concerning support and mental health services in Ukraine and in the host countries.

Study design
This is an international observational cohort study. The rationale is to evaluate women's perinatal mental health experiences throughout pregnancy and the first year after childbirth. The general study will extend from 01 December 2022 to 30 June 2023. This date can be changed depending on the situation of the war.

Setting
The study will be based online on https://blogs.uned.es/mama/ and carried out in European countries which host war refugees and in Ukraine.

Participants
The research sample consists of females in the time around childbirth. To be included in the study at the beginning, participants must meet the following criteria: Being pregnant or a biological mother of an infant up to 12 months of age.
Being 18 years or older. Being a war refugee from Ukraine (entrance to EU countries from 24 February 2022) or staying in Ukraine after/during the war.
Consenting to take part in the study. The exclusion criteria are: Not being currently pregnant or not being the biological mother of an infant up to 12 months of age.
Younger than 18 years of age. Not consenting to take part in the study.

Sample size
No restrictions have been put in place for participant registration. Nevertheless, the sample size was determined by taking into account the number of newborns in Ukraine. Consequently, a minimum sample size of 300 individuals will be recruited using a significance level of α-level of 0.05 and variability of 50%. It is essential to bear in mind, though, that the ongoing war situation, which includes the lack of electricity in Ukraine, the possibility of people evacuating cities, and missiles, may make it challenging to reach this sample size.

Variables and measures
An overview of the assessment measures is provided in Table 1.

Assessment, care, and trust-In pregnant and new mothers
This questionnaire includes 40 questions to record sociodemographic data, including current residence, education, number of prior pregnancies, the number of biological children (including miscarriages), the number of individuals residing in their home (adults and children), marital status, whether they are living with a partner, basic information concerning the location after the war outbreak and access to support, changes since the beginning of the war, exposure to armed-conflict or limitations to medical support and social support. This questionnaire was created for this study.

Edinburgh postnatal depression scale
The Edinburgh Postnatal Depression Scale (EPDS; Cox et al., 1987) is the most widely used self-assessment tool designed to recognized women at risk for perinatal depression (Hahn-Holbrook et al., 2017 < NICE. National Institute for Health and Care Excellence, 2017). This scale includes 10 items measuring common symptoms of depression and anxiety. The scores range from 0 to 30. The cut-off values of 10 or higher and 13 or higher are most often used to identify women who are at risk for depression (Levis et al., 2020). However, 13 has been shown to be the most useful cut-off point established in previous studies. The positive predictive value of EPDS is estimated to be 70% (Cox et al., 1987) or even 90% (Levis et al., 2020). A systematic review has also shown that the EPDS has good psychometric properties in low and middle countries (Shrestha et al., 2016). The EPDS has been validated in over 60 languages (Cox et al., 1987;Gibson et al., 2009;Cox, 2019;Vázquez and Míguez, 2019;Levis et al., 2020). The Ukrainian version, "Единбурзька шкала післяпологової депресії (ЕШПД)" was translated by the study authors.

Generalized anxiety disorder screener, GAD-7
The GAD-7 (Spitzer et al., 2006) is a 7-item instrument that assesses each of the seven symptoms of general anxiety disorder. The GAD-7 screens for anxiety symptoms in the general population and according to the criteria established by the Diagnostic and Statistical Manual of Mental Disorders (DSM)-IV and DSM-IV-TR (American Psychiatric Association, 1994;American Psychiatric Association, 2000). The GAD-7 total score ranges from 0 to 21. The scale's total score indicates the level of anxiety symptoms, with higher scores reflecting a greater anxiety severity. Scores of 5, 10, and 15 represent cut-off points for mild, moderate and severe anxiety, respectively (Spitzer et al., 2006). When screening for an anxiety disorder, a recommended cut-off point for referral for further evaluation is 10 or greater (Spitzer et al., 2006). The Ukrainian version of the GAD-7 is available (Romanchuk, 2011) but no psychometric properties have been studied yet. The GAD-7 has shown good psychometric properties during pregnancy (Soto-Balbuena et al., 2021) and the postpartum period (Simpson et al., 2014;Fairbrother et al., 2019).

Experience during the birth: City BIRTH
The City Birth Questionnaire (Ayers et al., 2018) evaluates PTSD symptoms within the context of childbirth and it contains 29 items related to the DSM-5 diagnostic criteria. It also has two other remaining questions related to the DSM-IV diagnostic criteria. This questionnaire examines participant's subjective feelings of discomfort related to a specific traumatic event. The City Birth Trauma Scale assesses two factors, Birth-related symptoms and General symptoms of re-experiencing the traumatic event (Ayers et al., 2018;Nakić Radoš et al., 2020). The scores range from 0 to 60. As the authors have pointed out, the scores for percentiles are 25th = 3, 50th = 9, 75th = 18. The questionnaire has shown good psychometric properties (Ayers et al., 2018;Nakić Radoš et al., 2020).
The Ukrainian version, "Міська шкала пологової травми" was translated for the purpose of the study by the authors.

Impact of events scale-revised
The Impact of Event Scale-Revised (IES-R; Weiss and Marmar, 1997) is a self-assessment tool measure for capturing the level of symptomatic response to specific traumatic stressors as it was manifested in the previous 7 days.
The scale has been translated into different languages (Baguena et al., 2001;Asukai et al., 2002) and different samples (Beck et al., 2008) with good psychometric properties.
A revised version of the Impact of Event Scale-Revised by Weiss and Marmar (1997), contains 22 items with scores gathered using a 5-point scale (0-4). What differentiates this revised version of the Impact of Event Scale (IES-R) from the previous one is that this latest version has seven additional questions and a scoring range of 0 to 88.
On this test, a score of 24 or more is clinically significant as it is indicative of an individual having full or partial PTSD. A score of 33 or more is the most accurate way to determine the probability of PTSD, and a score of 37 or higher is a strong indication of the disorder (Weiss, 2007).
This questionnaire considers the three dimensions of PTSD according to DSM-IV (Weiss and Marmar, 1997), including the following: Intruding recurring images, dreams, and/or thoughts or perceptual impressions related to the traumatic event; Agitation characterized by increased alertness, anxiety, impatience, and/or difficulty concentrating attention; and Avoidance manifested by efforts to get rid of thoughts, emotions, or conversations related to the traumatic event.

Translations of the measures
Three instruments were translated to Ukrainian in this study. The Edinburgh Postnatal Depression Scale (Cox et al., 1987) was translated by L.K., O. M-L., and A.V. The City Birth Trauma Scale (Ayers et al., 2018) was translated by L.K., O. M-L., A.V., and V.S. The impact of events scale-revised (Weiss and Marmar's, 1997) was translated by L.K., O. M-L., and V.K. The translation was carried out according to Brislin's translation model (Brislin, 1970;1986), applicable to the preparation of instruments for cross-cultural research. The back translations were carried out, and the detailed procedure of the translations is available from the authors.

Ethical standards
This study has been conducted in accordance with the protocols stated in the Declaration of Helsinki. Ethical authorization was given (21-PSI-2022). All national guidelines for data security are followed in the management of study data. Digitalized informed consent will be received from all members, and the confidentiality of all the data will be protected. The study design has been preregistered in ClinicalTrials.gov (ref: NCT05654987) following gold standards in research on cross-sectional studies, STROBE (Vandenbroucke et al., 2007).
Participation in the study can elicit changes in one's emotional state. To address this specific problem, at the end of the survey, a list of up-to-date services and resources will be provided where the participants can obtain information and help concerning mental health services and lactation advice. In addition, contact details of the lead research team for each nation will be available if participants wish to seek out further information. On request, the researchers will provide the participants with the global results of the study.

Procedure
Potential participants will be sought out through social media platforms (e.g., Twitter, Facebook, Instagram, LinkedIn, ResearchGate, WhatsApp), networks of educational institutions, healthcare facilities, and non-governmental organizations working in the area of perinatal Frontiers in Psychology 06 frontiersin.org mental health, policymakers, local organizations, and other stakeholders (utilizing the contacts provided by the Riseup-PPD), in addition to the personal networks of the research team members and through direct contact via text or email. Participants taking part in the study will be asked to click on the website link found on the general project website 1 in order to access the online questionnaire. They will then be presented with an electronic consent form that outlines the purpose and content of the questions, the risks and benefits, and the ethical considerations (such as voluntary participation, data confidentiality, secure storage of data, and the lack of financial compensation). At the bottom of the form, they must confirm that they meet the eligibility criteria and provide consent for the study. If a participant does not meet the criteria, they will be directed to a message thanking them for their interest and informing them of the requirements for participation. Completion of the baseline questionnaire is estimated to take around 35 min.

Data analysis Descriptive
At the beginning, descriptive statistics will be examined for all the study variables. To analyze the presence or not of the different variables (depression, anxiety or PTSD) concerning the different categorical variables, contingency tables will be made using Pearson's Chi-Square. Cramer's V will be used to calculate the effect size. Likewise, when the variables are continuous, Student's t will be used, and the effect size will be calculated using Cohen's d.

Psychometric properties
To examine the psychometric properties of the questionnaires in the Ukrainian language, several analyses will be reported. Exploratory Factor Analyses (EFA) will be conducted using Statistical Package for the Social Sciences (SPSS), Version 26 software. Analysis of the factor dimensional constraints will determine each model's underlying individual item loadings. Based on the results of the EFA, Confirmatory Factor Analysis (CFA) will then be analyzed. ECA will be used to analyze how to fit the models using several indexes such as Satorra-Bentler χ 2 , CFI, RMSEA and the confidence interval of RMSEA statistics will be calculated. Lagrange multipliers and Wald test will be sequentially performed to improve the models' fitness, following the study's hypotheses. Standardized coefficients and measurement equations with scores in R2 will be reported. These analyses will be conducted using the AMOS program.
Prediction models. To examine the risk and protective factors associated with perinatal mental health outcomes, a random sample of 70% of participants will be used to derive the machine learning algorithms, including regularized logistic regression, random forest, decision tree, and gradient boosting to predict the risk of perinatal mental health outcomes, and their performance, and the remaining 30% for validation. First, in the derivation sample, all predictors described above will be included in the models to estimate the probability of depression, anxiety, or PTSD. Beginning with a model containing all potential covariates, the variable with the least 1 https://www.blog.une.es.mama significant p value will be removed and tested using the likelihoodratio test until all variables left in the model significantly (at alpha = 0.05) contributed to the model.
In regularized logistic regression models, results will be presented as Odds Ratio (OR) with 95% confidence intervals (CIs).
Logistic regression analyses will be conducted using the steps forward procedure to examine which variables will predict the study's dependent variables. This regression analysis makes it possible to predict a dichotomous dependent variable based on predictor, categorical or quantitative variables the R 2 will be used to calculate the proportion of the explained variance of clinical outcomes by the selected predictors. The different aspects of model performance will be studied. The receiver operating characteristics (ROC) curves (and the corresponding area under the ROC curve-AUC) will also be calculated to test for discrimination characteristics.

Dissemination and data sharing plan
Data and resources obtained and utilized for the study will be made available to other qualified researchers in accordance with academic standards. Those who wish to gain access to the datasets and analyses can do so upon making a legitimate request. The results of the study will be published in peer-reviewed publications and presented at scholarly conferences both domestically and abroad.

Discussion
The current war in Ukraine affects every other European country in some ways. Since the war outbreak, the neighboring countries have absorbed and registered a high number of refugees on a daily basis (Chrzan-Dętkoś et al., 2022;Kumar et al., 2022;Lloyd and Sirkeci, 2022). Although the number of war refugees varies in European countries, every country faces similar challenges in providing adequate support and possible medical and psychological interventions for women during this vulnerable period; these challenges include language barriers, provision of culturally sensitive services and trauma-informed care, and equitable access to health and mental health services in each European country. Our study aims to assess the mental health needs of perinatal Ukrainian women in their home country and abroad to ascertain the risk and protective factors and the provision of services needed during the perinatal period. Systematic reviews (Hajak et al., 2021) show that migrants who have experienced armed conflict are particularly vulnerable to mental health issues and require mental health assistance. Women in the perinatal period are a vulnerable group, and their mental health may be further exacerbated during wartime.
The midwifery and obstetric care systems in European countries may be an important reference in identifying and caring for those affected. Screening for depression and anxiety with the EPDS and GAD-7, for example, may reduce the disparities observed in the cited literature. Knowing the rate and severity of mental health symptoms and the needs of female war refugees is the first step to creating a plan for helping and preparing services to supply this group of women.
Based on the literature, interventions supporting war-affected mothers and mother-babies dyads should be comprehensive, sustainable, and devoid of harm. Support should be multi-level, Frontiers in Psychology 07 frontiersin.org resilience-oriented, multidisciplinary, and tailored to the needs of the individual mother (Tol et al., 2011). The Inter-Agency Standing Committee (2007) proposed a multilevel intervention pyramid for mental health and psychosocial support in emergencies, which includes four levels of intervention: (1) provision of basic services and security, (2) community and family support, (3) focused non-specialized support, and (4) specialized support. All layers of the pyramid are essential and should be implemented concurrently according to the needs of the individual. However, to implement it, we need to begin to understand the impact of perinatal mental health of Ukranian perinatal women by investigate prevalence and associated risk and protective factors of mental health problems and the special needs of this target group.
Research shows that many of the European countries do not report specific clinical recommendations or specific guidelines for managing peripartum depression even for women living under normal conditions. Additionally, the existing guidelines vary a lot in the number and themes of clinical recommendations (Motrico et al., 2022). Therefore, the results from this study could assist The European Union and other nations' policymakers to Create a set of rules and strategies to help reduce the occurrence of mental health issues during pregnancy and childbirth in the Ukrainian crisis and other potential armed conflicts and war-forced migration to EU countries. The United Nations High Commissioner for Refugees (2019) report shows that due to persecution, armed conflicts, deficient healthcare and human rights violations, more than 70 million people worldwide were forcibly displaced from their homes by the end of 2018, with approximately one-sixth seeking protection abroad. Women account for nearly 50% of all refugees, internally displaced, and stateless persons (United Nations High Commissioner for Refugees, 2019). In the literature, we can find interesting reflections focusing on the methodology of studies of immigrants' mental health. For example, Crumlish and O'Rourke (2010) observed that very few scientists from refugee communities lead research in their communities or the refugee mental health field in general. Planning and implementation of research aimed at understanding these survivors are mainly in the hands of "mainstream academia. " In our study, we could reduce this bias while working in the international team and applying the study protocol together with Ukrainian researchers.

Conclusion
To sum up, this study is an international research project created to evaluate the effect of the Ukrainian War on the mental health of women during pregnancy. It will allow for a thorough overview of how the war has affected mental wellbeing during the perinatal period, which could then be used to support and guide refugees and providers in different situations. Ultimately, this research should provide concrete data for policymakers and healthcare professionals to utilize.

Ethics statement
The studies involving human participants were reviewed and approved by Comité de Ética de la Investigación, UNED (Madrid), the Research Ethics Committee of the Faculty of Psychology of Taras Shevchenko National University of Kyiv. The patients/participants provided their written informed consent to participate in this study.

Author contributions
MR-M contributed to conception and design of the study and wrote the first draft of the manuscript. MC-D contributed to conception and design of the study. AU contributed to conception. HG-L organized the database and wrote the first draft. LK and OM-L contributed to conception and design of the study and provided psychometric adaptation. AV provided psychometric adaptation and prepared collecting data. AM prepared collecting data. NM contributed to design of the study. H-NL reviewed and edit the final version. All authors contributed to the article and approved the submitted version.

Funding
This paper is based upon work from the COST Action Riseup-PPD CA 18138 and was supported by COST under COST Action Riseup-PPD CA18138 www.cost.eu.