Mapping the scientific research on integrated care: a bibliometric and social network analysis

Background Integrated care (IC) is the cornerstone of the sustainable development of the medical and health system. A thorough examination of the existing scientific literature on IC is essential for assessing the present state of knowledge on this subject. This review seeks to offer an overview of evidence-based knowledge, pinpoint existing knowledge gaps related to IC, and identify areas requiring further research. Methods Data were retrieved from the Web of Science Core Collection, from 2010 to 2020. Bibliometrics and social network analysis were used to explore and map the knowledge structure, research hotspots, development status, academic groups and future development trends of IC. Results A total of 7,501 articles were obtained. The number of publications on IC was rising in general. Healthcare science services were the most common topics. The United States contributed the highest number of articles. The level of collaboration between countries and between authors was found to be relatively low. The keywords were stratified into four clusters: IC, depression, integrative medicine, and primary health care. In recent years, complementary medicine has become a hotspot and will continue to be a focus. Conclusion The study provides a comprehensive analysis of global research hotspots and trends in IC, and highlights the characteristics, challenges, and potential solutions of IC. To address resource fragmentation, collaboration difficulties, insufficient financial incentives, and poor information sharing, international collaboration needs to be strengthened to promote value co-creation and model innovation in IC. The contribution of this study lies in enhancing people’s understanding of the current state of IC research, guiding scholars to discover new research perspectives, and providing valuable references for researchers and policymakers in designing and implementing effective IC strategies.


Introduction
With the changes in disease spectrum, the influence of social, natural environment and lifestyle on health became increasingly prominent. However, the fragmented healthcare service system and the single clinical discipline treatment method cannot effectively respond to patient requirements. In response to the challenges being faced by health systems, the World Health Organization (WHO) proposed the Integration of Health Care Delivery (IHCD) in 1996 (Integration of Health Care Delivery, 1996), and People-Centered Integrated Care (PCIC) strategy in 2015 (World Health Organization, 2015). These initiatives reflect the growing recognition of the importance of IC in improving health outcomes. However, the literature suggests that there is no single definition of IC, defining IC is an ongoing process, and its definition continues to evolve as the health system and environment change (Kodner and Spreeuwenberg, 2002;Lennox-Chhugani, 2021). Despite the absence of a clear definition, scholars have reached some consensus on the fundamental principles and goals of IC, and countries worldwide have been exploring tailored IC practices that suit their national contexts, which have demonstrated improvements in quality, efficiency, accessibility, and cost management of healthcare systems (Sweeney et al., 2007;Dudley and Garner, 2011;Maruthappu et al., 2015;Coates et al., 2022). Moreover, numerous studies have shown that achieving IC can generate significant health benefits, especially for the older populations, those with chronic conditions, the mentally ill, and other special people who need long-term care, such as reducing anxiety and fatigue in cancer patients, improving quality-adjusted life years in pediatric patients with asthma, and improving health-related quality of life while decreasing behavioral problems, as well as reducing caregiver burden in dementia patients (Lengacher et al., 2009;Andersen, 2014;Sun et al., 2019;Duenas-Meza et al., 2020;Schad et al., 2020;Ha et al., 2021). Some studies also showed that patients who received a fully integrated primary-secondary care model were more satisfied than patients who received treatment separately from the primary or secondary care sectors, and such patients could achieve better health outcomes (Uga et al., 2017;van Olmen et al., 2020;Donald et al., 2021). In addition, IC expands the perspective of clinical care from the biomedical to the biopsychosocial by treating comorbid psychiatric illness; IC also has significant effects on controlling symptoms and improving the physical fitness of schizophrenic patients (Smith, 2009;Sharpe et al., 2020). IC has become increasingly important in health care policy, multidisciplinary collaboration and clinical practice as a means to achieve high-quality services (Lewis et al., 2018).
From an academic perspective, extensive systematic reviews on IC have been undertaken with various goals in the past 10 years. For example, Hughes et al. (2020) identified an array of strategies and conceptual work of IC. Zonneveld et al., (2018) developed a set of underlying values of IC and discussed the practical applications and their uses. Rocks et al. (2020)evaluated the economic benefits of IC and suggested that IC is likely to reduce costs and improve outcomes. Bautista et al. (2016) developed a comprehensive framework to provide evidence on the state of the art in measuring IC. Overall, many studies have been undertaken on IC, but these analyses have mainly focused on specific aspects of IC, and comprehensive systematic analyses have been limited. Bibliometrics could quantitatively analyze scientific publications, but few bibliometric studies have been performed on research relating to IC. In 2013, Sun used the Bibliographic Item Co-occurrence Matrix Builder and SPSS to analyze the growth pattern, jurisdiction distribution, core journals and key research domains of IC (Sun et al., 2014). Li retrieved articles from 1997Li retrieved articles from to 2016 Histcite and VOS viewer to analyze publication numbers and citations, and co-authorship between countries and institutions and clusters of IC (Li et al., 2020). However, these two studies lacked the most recent data, single analysis tool was used and the data could not be fully mined. Therefore, we use a variety of tools to comprehensively analyze the status of IC through bibliometric analysis and social network analysis (SNA) to reveal the development status in multiple dimensions of IC to date. Specifically, we use publication growth trend, disciplinary areas distribution, international productivity and collaboration, author productivity and collaboration, citation analysis and keyword occurrence research hotspots and trends.

Data sources
Data illustrated here were retrieved from the Web of Science Core Collection (WOSCC), which is the most frequently used citation database for bibliometric analysis, and the structured data format provides considerable convenience to quantitative analysis. This study selects articles from four databases, namely, Science Citation Index Expanded, Social Sciences Citation Index, Conference Proceedings Citation Index-Science and Conference Proceedings Citation Index-Social Science & Humanities, as the data source.

Search strategy
Advanced search of WOSCC is used, and the research strategy was as follows: {[TS = ("integrat* care" OR "integrat* health" OR "integrat* healthcare" OR "care integration" OR "integrat* of care" OR "integrat* medic*")]}. The publication time span was limited to 2010.10.1-2020.10.12, and 7,501 publications were collected. Document Type: Article.

Bibliometrics analysis method
Bibliometrics is one of the key methods to objectively measure the influence of academic publications (Agarwal et al., 2016). It uses methods such as mathematical modeling, statistical analysis and SNA to explore the knowledge structure, research hotspots, development status, academic groups and future development trends of a certain field (Zhu and Guan, 2013).
CiteSpace and VOSviewer visualization software were used to depict the national cooperative science knowledge mapping. Nodes represent the author, institution, country or cited reference. The links between nodes represent the collaboration or co-occurrence relationships. The thickness of the connection represents the strength of cooperation. The purple node indicates high BC and acts as pivotal points in a field (Chen, 2006). In addition, we used Price's law, which Frontiers in Psychology 03 frontiersin.org is an indicator for analyzing productivity in a specific field (Lópezmuñoz et al., 2013). The lower limit for the number of publications in the core author group or the lower limit of the frequency of high-frequency keywords (M) is M N = 0 749 . max . N max represents the maximum value of the number of posts or the maximum value of frequency.

SNA
SNA is a method of studying nodes and their relationships. SNA can effectively identify the influence of each node and the interaction between nodes in the social network. The indicators to measure the influence of nodes are betweenness centrality (BC), closeness centrality (CC), and degree centrality (DC). BC represents the node's ability to control the connection between two non-adjacent nodes. The larger the value, the stronger the control ability of the entire network information flow, and is at the core of the entire network (Chen, 2005). CC represents the distance between the nodes. The smaller the distance, the larger the value, indicating that the node is in an important position in the entire network. DC is the number of nodes directly connected to the node. The larger the value represents the higher the importance, but it does not mean that the node is in the center of the network (Tonta and Darvish, 2010). Moreover, Ucinet and NetDraw were used for SNA in this study. Ucinet is a software package for social network analysis that provides tools for data management, analysis , and visualization. It can be used to analyze social network data and identify patterns in the structure of relationships between individuals or organizations. NetDraw is a visualization tool that can be used in conjunction with Ucinet to create network diagrams and visualize social network data (Borgatti, 2002;Cronin, 2015).

Tools
Firstly, we use Excel's bar graph to count the annual number of posts and the rate of change of posts ( Figure 1). Secondly, we used the WOSCC Literature Analysis Report to find out the distribution of disciplinary areas ( Figure 2). We then used BibExcel to extract the top 20 high-yield countries (Table 1; Persson et al., 2009). We used the CiteSpace visualization tool to depict the mapping of international productivity and collaboration ( Figure 3; Chen, 2006). Next, we use R Voice's BiblioMetrix to extract the number of articles posted by highly productive authors and other indexes (Table 2; Aria and Cuccurullo, 2017). Then, we used the Bibliographic Item Co-Occurrence Matrix Builder to extract the author co-occurrence matrix and imported SNA software Ucinet and NetDraw for drawing ( Figure 4; Liu, 2009). We then used BibExcel to extract high-frequency keywords (Table 3) and used VOSviewer visualization software ( Figure 5) to draw keyword co-occurrence knowledge mapping (keyword co-occurrence knowledge mapping) and the key in each word cluster (Table 4; van Eck and Waltman, 2010). Finally, we used CiteSpace to draw reference co-citation knowledge mapping (Table 5; Figure 6), highly cited documents (Table 6) and timelines ( Figure 7). Specific tools and diagrams are shown in Figure 8.  Figure 2 shows the distribution of the disciplinary areas on IC. The total number of documents in the top 10 disciplines is 6,886, accounting for 91.107%, namely, health care science services (1,559, Annual article counts on IC from 2010 to 2020.  Table 1 shows the top 20 countries ranked by the percentage of publications. The United States was the most productive country, with a total of 4,112, accounting for 54.82%, and the BC is 0.45, followed by the United Kingdom (656, 8.75%, 0.16) and Australia (501, 6.68%, 0.15). In terms of regions, Europe has 11 countries, accounting for 55%; Asia has 4 (20%), America has 3 (15%), and Oceania and Africa have 1 each (5% respectively). Combining Table 1 and Figure 3, the United States, with the largest number of publications and the highest BC, is at the center of the national cooperation network. In addition, countries such as the United Kingdom, Australia and the Netherlands have close cooperation with other countries, and they play important roles in the development of global IC. China has published 312 articles (4.16%) and ranks first in Asia, but the BC is only 0.08. showing that China lacks international cooperation with other countries on IC.

Author productivity and collaboration
The BiblioMetrix Tool Package in R development software was used to analyze all the authors in 7,501 studies, with a total of 31,958 authors. The number of authors per paper was 4.26, and the number of authors with one paper was 25,411, accounting for 79.5%.
According to Price's Law, authors of more than or equal to six articles (the core author), a total of 598 authors, and only the top 20 prolific authors are selected in this study. Then, software to calculate multiple indicators such as the number of essays, BC, CC, DC, h-index and g-index for the top 20 authors; multi-dimensional judgment of the author's influences is developed (Hirsch, 2005;Egge, 2006). As shown in Table 2, Ben-Arye E has published the most articles, with a total of 60 articles, followed by Schiff E and Jacobsen SJ. Distribution of disciplinary areas on IC.  Figure 4 shows the collaborative network of the top 20 productive authors. The nodes represent 20 core authors; The circle means BC is 0, the diamond means BC is 2, the upward-pointing triangle means BC is 6, the box means BC is 7, and the downwardpointing triangle means that BC is 14. Combining Table 2 and Figure 4, although Quesenberry CP does not have the largest number of articles, the BC is the largest, so he is at the center of the network. In addition, Quesenberry CP, Jacobsen SJ, Sidney S, and Karter AJ formed an academic group, who are from the same institution (Kaiser Permanente, Oakland, California, United States). The other academic group was formed by Ben-Arye E, Schiff E, and Samuels N. However, no cooperation occurred between the two groups. In addition, six authors did not cooperate with other authors.

Research hotspots
Noun items can be used to detect research hotspots in the field (Chiu and Ho, 2007). Keywords are nouns or phrases that reflect the core content of a publication , and high-frequency words represent the research hotspots (Xie et al., 2008). BibExcel was used to extract all the keywords in the literature, and after merging and removing duplication, a total of 12,449 keywords were obtained. Among them, 9,347 keywords appeared once, accounting for 75.08%. According to Price's Law, keywords with a frequency greater than or equal to 24 are considered high-frequency keywords. The top ten keywords by frequency are "IC" (1005), "integrative medicine" (547), "primary care" (349), "mental health" (167), "complementary and alternative medicine" (137), "qualitative research" (131), "integration" (129), "complementary medicine" (115), "primary health care" (115), and "quality of life" (110), as shown in Table 3.
VOSviewer was used to draw map keyword co-occurrence networks, as shown in Figure 5.
A total of 4 clusters and 1,144 lines were formed based on the Linlog/Modularity algorithm. These 4 clusters represent the research hotspots on IC in the past decade. Using the largest node in each International collaboration network of the 20 most productive countries.  Table 4. The keywords in the four clusters reveal the characteristics involved in the development of integrated healthcare. ① IC should be valuebased and health-centered, providing health services across the life cycle and achieving optimal health outcomes with limited resources. ② Service targets should include the whole population, not just special people who need long-term care.③ Focus more on health promotion and disease prevention, and to promote the integration of public health services and clinical care. ④ Pay attention to self-management and be the first responsible person for own health. ⑤ Attach importance to the role of complementary medicine in IC. ⑥ IC strategies need to be designed and developed taking account of the particular local realities.⑦ Promote incentive reform and give full play to the regulatory role of health insurance leverage to promote the development of IC. ⑧ Use digital technology to empower IC. ⑨ Establish effective governance, evaluation and accountability mechanisms.
3.6. Research trend 3.6.1. Reference co-citation analysis Document co-citation analysis is often used to detect historical evolution and research trends in the field (Chen et al., 2012). A total of 210,081 references are attached to 7,501 articles. CiteSpace was used to analyze these references. A total of 850 nodes and 3,176 lines were mapped. To highlight the role of key documents, the top 50 cited documents per year were selected as the analysis object.
Based on the log-likelihood ratio algorithm (Fang et al., 2018), and according to the silhouette value (the closer the value is to 1, the more reliable the clustering), clusters less than 0.7 were filtered out, finally forming seven clusters. The top three clusters were Cluster 0 (qualitative study), Cluster 1 (serious mental illness), and Cluster 2 (health systems integration), as shown in Figure 6 and listed in Table 5.

Highly cited articles analysis
Cited references have made revolutionary contributions to the entire research field. Therefore, co-citation analysis of highly cited references is helpful to detect the research foundation in the field (Hou et al., 2018). The largest node in each cluster in Figure 6 can be observed, and Table 6 lists the top 10 cited references according to their citation frequency and their categories.
As shown in Table 7, there is little stable understanding of IC meant, but all emphasize that IC guiding principle is person-centered, the core purpose is to improve the efficiency of the health system and ensures people receive a continuum health services. Moreover, coordination among stakeholders is critical to the accomplishment of goals. In general, the forms of IC are complex and multidimensional. The scope of integration includes organizational, services, funding, information, and regulatory. In terms of service recipients, the disadvantaged are the ones who get the most attention, IC can generate significant health benefits for them.

Cluster timeline visualization
To further clarify the historical evolution of research hotspots in the IC field, the timeline visualization was mapped based on 210,081 references. In Figure 7, references are shown in the form of circles whose thickness indicates the number of citations within the time slice. The citation tree-ring color represents the citation time, and red indicates that the cited reference has a high BC value. Figure 7 shows the internal and inter-relationship of the largest 7 clusters. The first cluster to emerge was Cluster3 (integrative medicine), which outlined the relevance of complex systems theory as an approach to health outcomes research in the context of integrative medicine. This theory recognizes that health outcomes are influenced by various complex and interconnected factors, including biological, psychological, social, and environmental factors. Cluster4 (patientcentered medical home), which focused on depressed older adults in primary care settings. However, these two research hotspots have not gained much attention in recent years. Although Cluster0 (qualitative study) appeared later, it gathered many red nodes from 2010 to 2018, implying that many highly cited references emerged Collaboration network of top 20 most productive authors.
Frontiers in Psychology 07 frontiersin.org in that period. Cluster6 (complementary medicine) also features several research hotspots in recent years, some of the main hotspots include depression, non-infectious diseases, chronic pain, multidisciplinary care planning, and mind-body practices such as meditation and yoga.

Discussion
We used various bibliometric tools to provide a comprehensive bibliographic review of IC from the Web of Science (WOS) from the period 2010-2020. Through approaches such as keyword frequency

Trends of interest and disciplinary distribution in IC research
Over the past 10 years, although the IC field has received increasing attention, the degree of attention has been gradually decreasing every year (Figure 1). This could be attributed to various factors, and one possible reason is that it has become more widespread, thus the initial novelty is fading and people are shifting their attention to other medical issues and priorities. While the attention given to IC may be decreasing, it is important to recognize its value and potential in improving healthcare outcomes. In terms of disciplinary area distribution (Figure 2), IC is widely distributed in multiple fields, such as health care sciences services, public environmental occupational health, health policy services, general and internal medicine, psychiatry, oncology, nursing, pharmacy and pediatrics, reflecting that Keyword co-occurrence network of the most frequent keywords by the counts.

Dominance of developed countries in IC research and importance of tailoring IC strategies to specific settings
In terms of the number of publications and the BC value (Figure 3), the top three countries were the United States, the United Kingdom and Australia. Combined with Table 1, the proportion of developed countries' publications is much higher than that of developing countries. Many high-income countries in Europe and America have adopted IC to address the health needs of aging populations and rising rates of chronic and multiple morbidities (Point, 2011;Kringos and Klazinga, 2014). For instance, IC has been available in the United States for 76 years, since Kaiser Permanente began offering the first IC insurance plan in 1945 (Craig et al., 1999;Laugesen and France, 2014). The English National Health Service has experimented with the integration of care since the 1990s and established 16 IC pilot programs with a range of objectives in 2008. To some extent, there is no one model of IC strategy that can fit all countries (Averill et al., 2010;Maruthappu et al., 2015), the design of specific measures should take into account the local culture, socioeconomic development, governance, and service recipients (Atun et al., 2010;Stadnick et al., 2019). However, even if different countries have different paths to achieve IC, there is a need to develop a uniform framework of principles. WHO has developed a common set of principles of IC that are comprehensive, equitable, sustainable, holistic, preventive, empowering, respectful, collaborative, co-produced, endowed with rights and responsibilities, governed through shared accountability, evidence-informed, led by whole-systems thinking and Ethical (World Health Organization, 2015). Furthermore, value-based healthcare has become an international consensus (Daniels et al., 2022;de Vasconcelos   Document co-citation network. Frontiers in Psychology 10 frontiersin.org  , 2022;Kokko, 2022). While WHO provides a thorough and widely-accepted IC framework, but there's potential for further refinement, context-specific adaptation, and inclusion of new concepts as healthcare evolves. The principles' effectiveness hinges on their practical implementation in real-world healthcare scenarios. Thus, countries should collaborate to enhance the value objectives, principles, and key elements of IC, and explore paths of integration tailored to each nation's characteristics within the theoretical framework.

Co-authorship networks and the need for improved collaboration in IC research
Bibliometrix R-tool was used to analyze the top 20 most productive authors (Table 2), Ucinet was used to manage the co-author matrix. Ben-Arye E had the most publications but a BC of 0 and was not placed in the control position in the network information; the author formed a triangular cooperation network with Schiff E and Jacobsen SJ. On the other hand, although Quesenberry CP only published 31 articles, he collaborated with several authors to form a large cooperative network. In addition, he had the largest BC and was at the center of the network, meaning that he acts as a bridge for information in the network. The analysis reveals that effective cooperation among authors is lacking, despite the formation of several scholar groups. This finding indicates a need for greater collaboration within the academic community, by promoting more effective collaboration, including theoretical exchanges and practical sharing, researchers can pool their expertise and resources to accelerate advancements in the field.

Interdisciplinary collaboration and trends in IC research
From BibExcel statistics, 93 high frequency keywords were extracted (Table 3). In addition to "integrated care" and "integrated Document co-citation analysis clusters timeline visualization.
Frontiers in Psychology 11 frontiersin.org health care, " the hot keywords included "primary care, " "mental health, " "complementary and alternative medicine, " "palliative care, " and "self-management. " By using the knowledge mapping tool VOSviewer to visualize keyword co-occurrence analysis (Figure 6), four further hotspot clusters were generated (Table 4). These results indicate that IC is not limited to the clinical field, but has broken down disciplinary barriers and encourages interdisciplinary cooperation, thus health systems should provide health services that integrate prevention, diagnosis, treatment, rehabilitation, and palliative care to cover the health needs of the region's residents. In addition, to meet the needs and preferences of the population, individuals should be seen as active participants in health management and take responsibility for their own health (Rittenhouse and Shortell, 2009;Singer et al., 2011). Science knowledge mapping was used to analyze reference co-citation, highly cited articles and timelines and detect and research historical evolution and trends. With the support of CiteSpace, 210,081 references were analyzed. According to document co-citation analysis, seven clusters were generated (Figure 6), namely, Cluster 0 (qualitative study), Cluster 1 (serious mental illness), Cluster 2 (health systems integration), Cluster 3 (integrative medicine), Cluster 4 (patient-centered medical home), Cluster 5 (chronic pain) and Cluster 6 (complementary medicine). We observed that the prominence of Cluster 0 (qualitative study) as the main cluster in keyword analysis could be due to its vital role in integrated healthcare research, where it is often used to investigate patient experiences, healthcare behaviors, and healthcare decision-making. Furthermore, we noted that the earliest research clusters are Cluster 3 (integrative medicine) and Cluster 4 (patient-centered medical home), which are related to the history of integrated healthcare development, from advocacy IHCD to encourage health systems to embrace PCIC approach to organizing health services. Notably, "complementary medicine" has become a hotspot in recent years, especially with the increasing prevalence of cancer, chronic diseases and mental illnesses; integration of complementary and western medicine can improve the quality of life of patients (Mongiovi et al., 2016;West, 2018;Saeed et al., 2019;Hübner, 2020). In addition, traditional Chinese medicine plays a positive role in the treatment of COVID-19 (Ren, 2020;Zhang et al., 2020). Thus, complementary medicine will continue to be a focus in the future, however, it should be noted that the use of CAMs in clinical practice needs to assess the effectiveness, and safety of CAM (Paoloni et al., 2022).

Key contributors and publications in the IC field
Among the top 10 frequently cited articles, four were concerned with integrated or integrative care, and the other articles were about pediatrics, collaborative care, complementary and alternative medicine, highlighting the interdisciplinary nature of IC. These highly cited articles were contributed by influential authors such as Valentijn PP, Koebnick C, Berwick DM, Barnett K and Woltmann E, who have made significant contributions to the development and advancement of the field, enhancing our knowledge and understanding of IC. The sources of articles with more citations and higher influential factors included the Lancet, the New England Journal of Medicine, the International Journal of IC and the American Journal of Psychiatry. High-quality periodicals have a positive effect on the development of the subject. These journals provide a platform for disseminating research findings and facilitating collaboration among researchers and healthcare professionals, contributing positively to the development of the field. Flowchart of this paper.

Challenges and solutions in advancing IC
The advancement of IC faces different challenges, especially in complex and changing external environments. Firstly, theory and practice are not in sync. Person-centered care is often defined as the core of IC, so people-centered care needs people-centered research, IC strategies should be based on co-creation with patients or citizens in ways that involve, engage and empower them, but a chasm remains between theory and practice (van der Vlegel-Brouwer et al., 2020). In addition, inter-organizational Frontiers in Psychology 13 frontiersin.org collaboration is the key to delivering IC. However, many barriers related to administration and regulation, resources and funding hinder the collaboration (Andersson et al., 2011;Koebnick et al., 2012;Boothroyd et al., 2015;Auschra, 2018;Simpson et al., 2023), Therefore, relevant authorities should take action to overcome such barriers. For example, China has proposed the "County Medical Alliance," which integrates the medical service network at the county, township and village levels in six areas: administration, personnel, finance, services, assessment and supply of medicine and equipment to provide a full, continuous and coordinated service for service recipients. Countries or regions with health service systems similar to those of China can learn from the "County Medical Alliance" model to promote the development of IC. Notably, financial incentives are potentially powerful tools to stimulate IC (Averill et al., 2010;Tsiachristas, 2016), but separate payment mechanism can block effective integration (Struckmann et al., 2017), moreover, each payment method has a certain negative incentive effect, so mixed payment should be adopted to support more effective and efficient IC system (Berenson and Rice, 2015;Stokes et al., 2018). Furthermore, silos of data collection on a cross-institutional level have created a fragmentation of electronic medical records in many countries, potentially hindering continuity of IC and resulting in clinical, and administrative inefficiencies (Bradley et al., 2017;Meinert et al., 2019;Eh et al., 2020). Governments should fully recognize the great value of medical data, strengthen information systems and promote legal and compliant medical data sharing.

Study limitations
The present study had several limitations that need to be mentioned. Firstly, we only focused on articles that have been published in WOSCC and excluded non-English articles or neglected other forms of publication (e.g., books, web pages, and policy documents), which might cause the data obtained to be not comprehensive enough. Additionally, although bibliometrics could provide a valuable mix of information to reflect the current status and research hotspots of the IC domain, it cannot reveal the overall situation in the field, especially when other methods, such as the Latent Dirichlet Allocation model, which can be used for qualitative examination, are ignored. Therefore, Future research could expand our study's findings by including non-English publications and various formats, using additional bibliometric tools like the Latent Dirichlet Allocation model, focusing on the application of identified IC principles and models in diverse healthcare settings, and integrating qualitative research methods for a more comprehensive understanding of the research landscape, emerging themes, and trends.

Conclusion
In conclusion, the global field of IC has expanded and achieved remarkable results in the last 10 years. Developed countries pay more attention to the development of IC than do developing countries, and minimal cooperation occurs among authors and institutions. In addition, results indicated four hotspot clusters, namely, IC, depression, integrative medicine and primary health care. Combined with cluster timeline visualization, complementary medicine has become a hotspot in recent years and will continue to be a focus. Furthermore, there are still many challenges and barriers to IC to achieve personcentered care, these include, but are not limited to resources fragmentation, efficient collaboration difficulties between different levels of health institutions, insufficient financial incentives, inadequate self-management in health, and poor information sharing. So international collaboration should be further strengthened to promote the development of integrated healthcare with value co-creation and model innovation. These findings will help scholars better identify new perspectives for future research.

Author contributions
DG, HL, DS, and YC designed the study. DG, CZ, and XC performed the data analyses. DG, CZ, GG, and XC wrote the initial draft of the paper. All authors contributed to the article and approved the submitted version.

Funding
This work was supported by the National Natural Science Foundation of China (Support batch number: 71974066) and "Double First-class Construction Project of Liberal Arts in Huazhong University of Science and Technology" (Think Tank of Rural Health Service Policy and Management).