Systematic Review ARTICLE
A Systematic Review of Efficacy, Safety, and Tolerability of Duloxetine
- 1Translational Neuroscience Research Group, Galicia Sur Health Research Institute (IISGS), University of Vigo, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Vigo, Spain
- 2Head of Department of Psychiatry, Health Area of Vigo, Servizo Galego de Saúde (SERGAS), Vigo, Spain
- 3Director Neuroscience Area, Galicia Sur Health Research Institute (IISGS), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Vigo, Spain
- 4Translational Neuroscience Research Group, Galicia Sur Health Research Institute (IISGS), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Vigo, Spain
Duloxetine is a serotonin-norepinephrine reuptake inhibitor approved for the treatment of patients affected by major depressive disorder (MDD), generalized anxiety disorder (GAD), neuropathic pain (NP), fibromyalgia (FMS), and stress incontinence urinary (SUI). These conditions share parallel pathophysiological pathways, and duloxetine treatment might be an effective and safe alternative. Thus, a systematic review was conducted following the 2009 Preferred Reporting Items (PRISMA) recommendations and Joanna Briggs Institute Critical (JBI) Appraisals guidelines. Eighty-five studies focused on efficacy, safety, and tolerability of duloxetine were included in our systematic review. Studies were subdivided by clinical condition and evaluated individually. Thus, 32 studies of MDD, 11 studies of GAD, 19 studies of NP, 9 studies of FMS, and 14 studies of SUI demonstrated that the measured outcomes indicate the suitability of duloxetine in the treatment of these clinical conditions. This systematic review confirms that the dual mechanism of duloxetine benefits the treatment of comorbid clinical conditions, and supports the efficacy, safety, and tolerability of duloxetine in short- and long-term treatments.
Depression and chronic pain are disabling and often concomitant pathologies; both are currently two of the main public health problems (1, 2). Major depressive disorder (MDD) is the most prevalent psychiatric disease and has been recognized as a critical target of intervention in the psychiatric field (3, 4). However, depression remains underdiagnosed and consequently, undertreated (4, 5). Furthermore, generalized anxiety disorder (GAD), obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD) are common psychiatric comorbidities with MDD, usually lead to worse prognosis and compromise the remission of MDD symptoms (6).
GAD is one of the most prevalent psychiatric disorders, affecting 6% of the population during their lifetime (7, 8). GAD is a chronic condition that severely affects the quality of life, due to its repercussion on working and social functioning (8). Even though anxiety is a widespread symptom, the diagnosis of GAD requires a complex process of screening for a correct diagnosis (9). Moreover, GAD is usually associated with other clinical conditions such as MDD or pain syndromes, affecting drastically prognosis, and treatment efficacy (10).
Chronic pain is a persistent pain condition with a dual dimension, based on the signaling mechanism pathways: nociceptive and neuropathic pain (NP) (11). Specifically, NP has a strong emotional implication, and has been associated with worse quality of life, and clinically, it is related with affective disturbances such as depression, anhedonia, working memory dysfunction, sleep disturbances, anxiety, and impaired cognition (12–14). Moreover, chronic pain involves a stress component that might play a bidirectional predictive role. That is, chronic stressful events produce biochemical and pathophysiologic alterations that lead to stress-related mood disorders, that also may increase the risk of chronic pain or exacerbate it (14, 15).
On the other hand, fibromyalgia syndrome (FMS) is a chronic widespread pain condition with high heterogeneity clinically and etiologically (16, 17). It is estimated that 4–6% of adults worldwide suffer from FMS, whose incidence is increased in women (18). The most debilitating symptom of FMS is generalized pain. Other symptoms such as fatigue, sleep disturbances, cognitive impairment, or headache are also part of the core symptoms of FMS (19). Concomitantly, MDD symptoms also overlap with the FMS, as well as GAD that is significantly higher in patients with FMS (20, 21).
There is a possible connection between anxiety, depression, and stress urinary incontinence (SUI). Evidence suggests that both anxiety and depression are predictor of SUI onset (22). SUI is characterized by an unintentional urinary leakage due to coughing, exertion or sneezing, which increase the intra-abdominal and bladder pressure that overcome urethral resistance (23). Serotonin (5-HT) pathways are involved in this disorder. Thus, 5-HT induces the urethral sphincter closure by inhibition of the micturition reflex (22).
In this perspective, duloxetine is a potential treatment for these dissimilar clinical conditions, but with shared pathophysiological pathways. Duloxetine is a serotonin-norepinephrine reuptake inhibitor (SNRIs) approved as a first-line drug to treat MDD, GAD, diabetic peripheral neuropathy (DPN), FMS and SUI (24–28). As a SNRIs, duloxetine increases both levels of serotonin and norepinephrine which are directly correlated with adverse events, such as tachycardia, hypertension, among others (29). Pharmacokinetic and pharmacodynamic data of duloxetine have been reported for several studies, whose evidence suggests that duloxetine is generally well-tolerated (30–33). Thus, the main goal of this systematic review was to determine the efficacy, tolerability, and safety of duloxetine in the treatment of the clinical conditions for which it is approved.
A qualitative systematic review of literature was performed, following the 2009 Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines, and the Joanna Briggs Institute (JBI) critical appraisal checklist for the different types of studies reviewed (34). This systematic review aimed to describe and synthetize the evidence and potential benefits of duloxetine.
The protocol was registered in the international database PROSPERO of the National Institute for Health and Research (NIHR) with the code CRD42020153634.
To accomplish this comprehensive systematic review the following inclusion criteria were assumed: all studies written in English and focused on human adults (at least 18 years old) with MDD, GAD, NP, FMS, or SUI (clinical conditions for which duloxetine has approval), published until 01/09/2020. Those studies whose primary outcomes were efficacy, tolerability, and/or safety of duloxetine were included. Studies focused on other psychiatric or neurological condition such as Parkinson's disease, Alzheimer's disease, chronic non-neuropathic pain, bipolar, schizoaffective, and schizophrenia disorders were excluded. Moreover, qualitative research reports were also excluded, as well as reports whose analyses were based on pooled integrative data analysis of randomized control trials (RCTs). Eligible designs included RCTs, non-randomized experimental studies, case-control, and cohort studies, which outcomes were quantitatively measured by social, functional, cognitive, quality of life (QoL), or treatment emergent adverse events (TEAEs) instruments.
Data Sources and Search Strategy
Studies were selected from PubMed, Medline, Web of Science, and PsycINFO electronic databases, introducing the search terms: “duloxetine” AND “major depressive disorder” OR “MDD”; “duloxetine” AND “generalized anxiety disorder” OR “GAD”; “duloxetine” AND “neuropathic pain”; “duloxetine” AND “fibromyalgia”; and “duloxetine” AND “stress urinary incontinence.” Two independent researchers (DRA and JMO) conducted the search strategy, applying the filters described in the inclusion criteria to refine the process and obtain concise results.
Authors independently screened the reports. Firstly, titles and abstracts were reviewed to evaluate their concordance with our requirements. Secondly, the full-text of the potential studies were screened and appreciated and those that met our inclusion criteria were selected. Finally, 85 studies were included in this systematic review. Discrepancies were resolved through discussion among the authors until consensus was reached.
Data Extraction and Synthesis
To summarize the relevant information of the selected studies, the authors extracted and performed a Table with the following data: first author and year of publication, number of participants, gender, mean age (years), duloxetine dose per day (mg), duration of the treatment (weeks), diagnosis scales or other clinical measuring instruments, relevant statistical results, type of study, and the principal outcomes. The process of synthesis allowed a critical appraisal of the studies and the effect size calculation based on the statistical data reported by studies.
The first stage of the searching process comprised a search in the electronic databases using specific search terms, where 2,661 reports were identified. In the second stage, inclusion criteria were applied, duplicate reports were removed, and 727 records by title and abstract were studied. Three hundred and forty-two studies were analyzed in the third stage, and their full-text versions were carefully examined. In this stage, they were 85 eligible studies that met the inclusion criteria and the JBI recommendations (Supplementary Tables 1–4). Finally, in the fourth stage, studies on the different clinical conditions for which duloxetine treatment is approved −32 studies on major depressive disorder (MDD), 11 studies on GAD, 19 studies on NP, 9 studies on fibromyalgia, and 14 studies on SUI were selected (Figure 1).
Figure 1. PRISMA 2009 flow diagram of search process. MDD, major depressive disorder; GAD, generalized anxiety disorder; NP, neuropathic pain; SUI, stress urinary incontinence.
The eligible studies were examined and categorized by clinical condition. Five clinical conditions were considered for the treatment with duloxetine: MDD, GAD, NP, FMS, and SUI. Thus, eighty-five studies were scrutinized and a total of 34,808 participants were enrolled (25,448 female, 9,108 male; and 581 participants that in their study were not differentiated by gender), with an age range of 18–97 years. The studies included 21,406 patients that were treated with duloxetine with a dose ranged from 20 to 120 mg and a treatment duration of 12 ± 14.39 weeks. The main reasons of dropout were adverse events (59.5%), lack of effectiveness (20.3%), patient's decision (9.5%), loss of follow-up (5.4%), non-adherence to treatment (2.7%), hospitalizations (1.3%), and others (1.3%). Within adverse events, the most common were nausea (18.13%), dry mouth (9.69%), constipation (7.42%), and somnolence (5.94%) (Figure 2). Cardiovascular disease was an exclusion criterion of 7% of the studies, and cardiovascular adverse events (hypertension, tachycardia, myocardial ischemia, increased blood pressure, and arrythmia) were evaluated in 68.2% of the studies, where 49.4% reported statistical insignificance for these TEAEs (P <0.05), and 11.8% showed a correlation between elevated heart rate and duloxetine treatment. Regarding the type of studies, 58.7% of the studies are RCTs, 25.9% are cohort studies, 11.8% are quasi-experimental studies (non-randomized) and 3.5% are case-control studies.
Figure 2. Adverse events of duloxetine-treated patients and placebo patients. Bar graph of the most common adverse effects vs. the number (N) of participants who developed them (Ntotal duloxetine-treated patients = 4,848 and Ntotal placebo patients = 3,536). The table shows the corresponding percentage.
Major Depressive Disorder
MDD studies comprised 1,836 patients that were treated with 20–120 mg of duloxetine during 8 ± 17.05 weeks. This condition was diagnosed based on the Diagnosis and Statistical Manual of Mental Disorders (DSM) from their third to fifth edition. Efficacy of duloxetine was measured in 78.1% of the studies using the Hamilton Depression Rating Scale (HAMD), the Geriatric Depression Scale (GDS), the Montgomery and Asberg Depression Rating Scale (MADRS) or the Brief Pain Inventory (BPI) when pain, and MDD were concomitant. Safety of treatment with duloxetine was assessed in 25% of the studies based on TEAEs, and tolerability was evaluated in 31.3% of studies (35–66). Twenty-six studies were able to demonstrate the superiority of duloxetine over placebo or other antidepressants such as sertraline, fluvoxamine, venlafaxine, paroxetine, escitalopram, fluoxetine, and bupropion. Five studies did not find statistical significance (P ≥ 0.05) regarding the correlation between duloxetine and the outcomes and one study did not obtain significant results when comparing duloxetine with sertraline. Safety and tolerability were evaluated by TEAEs and the most common adverse events (AEs) were nausea, somnolence, dry mouth, hyperhidrosis, constipation, and sedation; patient's dropout rate was ~10% (Figure 2). This result was not significant in most of studies, concluding that duloxetine was safe and well-tolerated (see Table 1).
Generalized Anxiety Disorder
Eleven studies focused on GAD were included in this systematic review, which involved 2,608 patients treated with 20–120 mg of duloxetine with an average duration of treatment of 10 ± 6.59 weeks. All studies used the DSM to accomplish the diagnosis. Clinical evidence was based on the correlation between the Hamilton Anxiety Rating Scale (HAMA) and the outcomes. Therefore, all studies found statistical significance (P ≤ 0.05) when measured the efficacy (90.9% of the studies), safety and tolerability (both 27.3% of the studies) (67–77). TEAEs were measured and nausea, dry mouth, dizziness, and somnolence were reported as the most frequent AEs (Figure 2). One study reported suicidal ideation, although no statistical significance was found between duloxetine and placebo groups (69). Duloxetine was more effective, safe and tolerated than placebo or other antidepressants (escitalopram and venlafaxine) (Table 1).
The selected NP studies reported the use of duloxetine in the treatment of peripheral neuropathy induced by chemotherapy, diabetic peripheral neuropathic pain (DPNP), radiculopathy and neuropathic pain associated with multiple sclerosis (NP-MS) (Table 1). NP condition was diagnosed using specific criteria of pain detection, being the BPI the most commonly applied instrument. TEAEs were the measure for safety and tolerability. The dose of duloxetine applied was ranged from 20 to 120 mg during 12 ± 14.53 weeks. The core of the studies focused on 4,627 patients with NP, where the efficacy, safety, and tolerability of duloxetine were compared with placebo, anticonvulsant treatments (pregabalin and gabapentin), other antidepressants (venlafaxine and amitriptyline), or even with different daily doses of duloxetine. Thus, 78.9% of the studies reported efficacy outcomes, 47.4 and 21.1% of the studies described safety and tolerability of duloxetine, respectively (78–96). Three studies did not show statistical significance regarding efficacy, safety, and tolerability of duloxetine against anticonvulsants (P ≥ 0.05). Nausea, somnolence, insomnia, constipation, and decreased appetite were the most prevalent TEAEs (Figure 2). A minority of patients discontinued the treatment with duloxetine due to AEs (12.2%). Nevertheless, 84.2% of the studies supported the evidence of duloxetine as first-line treatment of NP conditions.
Nine studies focusing on FMS were assessed and eligible. They involved a total of 1,918 patients. The average duration of treatment was 24 ± 13.78 weeks and the dose of duloxetine oscillated from 20 to 120 mg per day (Table 1). The BPI scale and Fibromyalgia Impact Questionnaire (FIQ) were the instruments employed to analyse the outcomes. Most studies (77.8%) evaluated the efficacy of duloxetine, and 55.6% provided data of the treatment safety (97–104, 119). Statistically significant results were obtained in seven studies, where duloxetine improved symptomatology, reducing the pain impact registered by BPI. In contrast, two studies reported no statistical differences relative to BPI change average and cognitive improvement in fibromyalgia patients. The duloxetine treatment was related to ~17% of adverse effects. Taking all these studies into account, duloxetine showed to be safe and effective in FMS treatment.
Stress Urinary Incontinence
Fourteen studies that involved 6,395 patients (99.5% female and 0.5% male) were assessed. Duloxetine doses were between 20 and 120 mg per day. Treatment duration was 12 ± 6.72 weeks and the Incontinence Episode Frequency (IEF) and Incontinence Quality of Life (I-QoL) were the instruments to measure the outcomes. All studies evaluated efficacy of duloxetine; 71.4 and 7.1% of the studies measured safety and tolerability, respectively (105–118). Treatment was discontinued in 22.1% of patients regarding TEAEs, being the most common fatigue, nausea, constipation, and dry mouth (Figure 2). These AEs tend to improve and disappear with continuing duloxetine therapy. In conclusion, significant results were found in all studies, proving the efficacy, safety, and tolerability of duloxetine in the treatment of SUI.
A systematic review summarizes the evidence of the relevant literature, however, an unbiased search of studies without an explicit assess strategy could lead to a poor scientific report. The relevance and quality of the studies selected and included in this systematic review fulfilled the PRISMA recommendations (120), and JBI critical appraisal guidelines. The JBI is an evidence-based organization that develops strategies to conduct and perform a high quality systematic reviews (121). Thus, the quality determination of the studies included indicates that our research minimizes the risk of selection bias. Furthermore, a good systematic review relies on the studies it contains. Therefore, the inclusion of RCTs and clinical trials reduce the probability of bias due to their strict methodology (122).
In the last years, mutual pathophysiological mechanisms have been identified in depression, pain, and anxiety (11). Neuropathic pain, specifically DPNP, coexists with mental disorders, predominantly with depression and anxiety (123). Highlighting the functional impairment as a result of unremitting pain symptoms, neuropathy has been correlated with an increased risk of depression (124). On the other hand, the widespread spontaneous pain is the most debilitating symptom of FMS, that might be a link to depression and anxiety disorders as comorbid conditions (125). Due to the similar pathophysiologic mechanisms and high occurrence of FMS and depression, these clinical conditions were considered under a common approach to affective disorders, GAD and PTSD (19). Urinary incontinence is also a severe problem that affects 15–30% of adults over 60 years, and several studies have reported a link between urinary incontinence, anxiety and depression in women (22, 126).
The core of the pathophysiology of these clinical conditions is mostly due to the disruption of 5-HT and norepinephrine (NE) pathways (19, 22, 127). The monoaminergic hypothesis is based on a partial or total deficit of 5-HT or NE in the central nervous system (CNS) (128, 129). Somatic symptoms such as muscle tension, neuropathic and musculoskeletal pain, fatigue, or dizziness are common in MDD and GAD among other psychiatric disorders as result of aberrant 5-HT and NE neurotransmission (130). Regarding pain, antinociception and pronociceptive modulation occurs through 5-HT receptors, in both the central and peripheral nervous systems (131). As in pain, SUI involves the action of monoaminergic system. Evidence demonstrates that endogenous regulation of serotoninergic and noradrenergic mechanism in the spinal cord works simultaneously to maintain the reflex of urinary continence (132).
Therefore, the pharmacological treatment of clinical conditions with similar pathophysiology involves a global perception of coexisting disorders. In this sense, antidepressants such as duloxetine have been considered effective in the treatment of MDD, GAD, NP, FMS, and SUI (133). Duloxetine is a serotonin-norepinephrine reuptake inhibitor, that is, a potent inhibitor of 5-HT transporter (SERT) and norepinephrine transporter (NET) (134). Due to this dual mechanism, its profile seems to have a different response compared to selective 5-HT reuptake inhibitors (SSRIs) (135). In vivo studies, duloxetine presented preferential inhibition of 5-HT reuptake and low affinity for hitamine-H1, alpha-1-norepinephrine, 5-HT(1A, 1B, 1D), muscarinic acetylcholine, and opioid receptors (136). Clinically, duloxetine has been approved for diverse clinical conditions, acquiring new evidence over the years, also being prescribed to treat other neuropathic pain conditions and chronic musculoskeletal pain (80, 137).
In this systematic review, we considered the efficacy, safety, and tolerability of duloxetine in the treatment of current approved clinical conditions. Firstly, an individual search by clinical condition was achieved based on specific inclusion criteria. This strategy allowed us to find consistent results and objectively evaluate the outcomes. Concerning efficacy, duloxetine demonstrated effectiveness in over 80% of cases. However, some TEAEs are frequent, such as dry mouth, somnolence, nausea, constipation or hyperhidrosis, tending to decrease in time and disappear with continuing duloxetine therapy. Cardiovascular adverse events, such as hypertension, increased heart rate, myocardial ischemia, are also associated with duloxetine administration (29). Within these, only the increase in heart rate was statistically significant, although not being clinically relevant. In sum, duloxetine was considered in all assessed reports as a safe and well-tolerated treatment even in cardiovascular disease, as well as in elderly patients (29, 51, 82, 93). In this sense, our results prove that duloxetine is an option with a valid and consolidated therapeutic value. Secondly, we focused on the clinical conditions' comorbidity. The coexistence of depression, anxiety, and pain is a frequent state, as well as, depression and SUI, and FMS and depression. Therefore, the treatment with duloxetine is largely used due to its dual mechanism that ameliorate the symptoms associated with the concomitant clinical conditions (e.g., MDD and NP). Moreover, we observed a strong link between MDD and pain. This correlation suggests a bidirectional pattern: MDD could be a predictor of chronic pain which in turn might predict the persistence of MDD (138). Thirdly, although the dropout rate with duloxetine treatment reaches around 20% in certain cases, similar rates were found in placebo and other antidepressants or anticonvulsants treatments. Finally, some considerations should be taken into account regarding to duloxetine prescription and titration. Alcohol, tobacco and coffee (caffeine) are the most widely consumed psychoactive substances worldwide (139, 140). Evidence suggests that plasmatic serum levels of duloxetine were decreased (about 15%) in smoking patients due to the induction of CYP1A2 (141). Hepatotoxicity was also observed in patients whose alcohol consumption was significant (142). Lastly, caffeine is also metabolized by CYP1A2, like duloxetine, and this may increase duloxetine serum levels. However, this interference needs more supporting evidence.
We performed this systematic review in order to include as much evidence as possible. In this process, we analyzed a large number of studies to support our conclusions. Nevertheless, we found some limitations. The inclusion criteria exclude reports in a language other than English. Thus, significant studies may have been missed with this strategy. Our research protocol dismisses qualitative and pooled integrative data analysis of RCTs to avoid repeated analysis of RCTs data and qualitative findings duplication. Regarding the effect size of studies, some of them did not report sufficient statistical data to compute Hedges's g (e.g., standard deviation). However, we decided to include these 19 studies due to their relevance respect to the evaluated outcomes.
In conclusion, there is a substantial amount of evidence in support of efficacy, safety, and tolerability of duloxetine in the treatment of MDD, GAD, NP, FMS, and SUI. The dose range of 60–120 mg daily demonstrated efficacy in most of the studies assessed. TEAEs were mild to moderate, and AEs decreased or remitted with continuing duloxetine treatment. Treatment discontinuation due to both AEs and ineffectiveness of duloxetine yielded enough acceptable results to conclude that duloxetine is safe and well-tolerated. In addition, duloxetine is a monotherapy approach that might be useful to treat concomitant disorders with parallel pathophysiological pathways such as MDD and NP, which is an advantage for patients (avoiding polytherapy issues) and a successful cost-effective alternative.
Data Availability Statement
All datasets generated for this study are included in the article/Supplementary Material.
Data analysis and the first draft of the manuscript was written by DR-A and TR-B. All authors contributed to the study design, acquired data to analysis, and read and approved the final manuscript.
This work was financially backed by the Foundation for Science and Technology (FCT, Fundação para a Ciência e Tecnologia) within the framework of grant SFRH/BD/135623/2018 awarded to DR-A and another grant of Fundación Tatiana Pérez de Guzmanel Bueno provided to CS. Our research was further supported by the Carlos III Health Institute (ISCIII, Instituto Carlos III) through grant P16/00405 and co-funding awarded by the Spanish Foundation of Rare Diseases (FEDER, Fundación Española de Enfermedades Raras) to JO.
Conflict of Interest
JO declares paid positions, honoraria or being part of advisory boards by Angelini, AstraZeneca, Bristol-Myers, Casen Ricordati, Esteve, GSK, Janssen, Lilly, Lundbeck, Novartis, Otsuka, Pfizer and Sanofi, and grants from Ministry of Health Spanish National Institute of Heath Carlos III, National Substance Abuse Plan, and Galician Innovation Programs (GAIN) in the last 10 years.
The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
The authors would like to thank the Galicia Sur Health Research Institute (Instituto de Investigación Sanitaria Galicia Sur) and the University Hospital Complex of Vigo (Complexo Hospitalario de Vigo) for their support. In addition, the authors are especially thankful for the aid provided by the Psychiatric Nursing and Psychiatry Services of the Álvaro Cunqueiro and Nicolás Peña hospitals.
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpsyt.2020.554899/full#supplementary-material
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Keywords: duloxetine, clinical conditions, efficacy, safety, tolerability
Citation: Rodrigues-Amorim D, Olivares JM, Spuch C and Rivera-Baltanás T (2020) A Systematic Review of Efficacy, Safety, and Tolerability of Duloxetine. Front. Psychiatry 11:554899. doi: 10.3389/fpsyt.2020.554899
Received: 27 July 2020; Accepted: 24 September 2020;
Published: 23 October 2020.
Edited by:Mirko Manchia, University of Cagliari, Italy
Reviewed by:Kabirullah Lutfy, Western University of Health Sciences, United States
Anna Brancato, University of Palermo, Italy
Copyright © 2020 Rodrigues-Amorim, Olivares, Spuch and Rivera-Baltanás. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Tania Rivera-Baltanás, email@example.com