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Yu L, Xu C, Zhang M, Zhou Y, Hu Z, Li L, Li Y, Tian J, Xu M. Top 100 cited research on COVID-19 vaccines: A bibliometric analysis and evidence mapping. Hum Vaccin Immunother 2024; 20:2370605. [PMID: 38977415 PMCID: PMC11232646 DOI: 10.1080/21645515.2024.2370605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Accepted: 06/17/2024] [Indexed: 07/10/2024] Open
Abstract
The outbreak of the COVID-19 has seriously affected the whole society, and vaccines were the most effective means to contain the epidemic. This paper aims to determine the top 100 articles cited most frequently in COVID-19 vaccines and to analyze the research status and hot spots in this field through bibliometrics, to provide a reference for future research. We conducted a comprehensive search of the Web of Science Core Collection database on November 29, 2023, and identified the top 100 articles by ranking them from highest to lowest citation frequency. In addition, we analyzed the year of publication, citation, author, country, institution, journal, and keywords with Microsoft Excel 2019 and VOSviewer 1.6.18. Research focused on vaccine immunogenicity and safety, vaccine hesitancy, and vaccination intention.
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Affiliation(s)
- Liping Yu
- Child Rehabilitation Department, Gansu Rehabilitation Center Hospital, Lanzhou, Gansu, China
| | - Caihua Xu
- Evidence-Based Medicine Center, Lanzhou University, Lanzhou, Gansu, China
- School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Mingyue Zhang
- Evidence-Based Medicine Center, Lanzhou University, Lanzhou, Gansu, China
- School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Yongjia Zhou
- School of Nursing, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Zhiruo Hu
- School of Nursing, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Lin Li
- Evidence-Based Medicine Center, Lanzhou University, Lanzhou, Gansu, China
- School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Yiyi Li
- School of Nursing, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Jinhui Tian
- Evidence-Based Medicine Center, Lanzhou University, Lanzhou, Gansu, China
- School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Mingli Xu
- College of Traditional Chinese Medicine, Gansu Health Vocational College, Lanzhou, Gansu, China
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Liu Q, Yang S, Chen H. Global trends and hotspots in the study of the effects of PM2.5 on ischemic stroke. JOURNAL OF HEALTH, POPULATION, AND NUTRITION 2024; 43:133. [PMID: 39198927 PMCID: PMC11360839 DOI: 10.1186/s41043-024-00622-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2024] [Accepted: 08/14/2024] [Indexed: 09/01/2024]
Abstract
AIM The objective of this study was to visually analyse global research trends and hotspots regarding the role of PM2.5 in ischemic stroke. METHODS The Web of Science core collection database was used to search the literature on PM2.5 and ischemic stroke from 2006 to 2024. Visualization analysis was conducted using CiteSpace, VOSviewer, and an online bibliometric platform. RESULTS The analysis comprises 190 articles published between 2006 and 2024 by 1229 authors from 435 institutions in 39 countries, across 78 journals. Wellenius GA has the highest number of published and cited papers. China has the highest number of papers, while Canada has the highest citation frequency. Capital Medical University published the highest number of papers, and Harvard University had the highest citation frequency for a single paper. The study investigated the impact of PM2.5 on ischemic stroke in three phases. The first phase analysed hospitalisation rates for correlations. The second phase utilised large-scale multi-cohort data from around the world. The third phase involved studying global exposure risk through machine learning and model construction. Currently, there is limited research on the mechanisms involved, and further in-depth investigation is required. CONCLUSION This paper presents a bibliometric analysis of the research framework and hotspots concerning the effect of PM2.5 on ischemic stroke. The analysis aims to provide a comprehensive understanding of this field for researchers. It is expected that research on the effect of PM2.5 on ischemic stroke will remain an important research topic in the future.
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Affiliation(s)
- Qian Liu
- Cerebrovascular Disease Department, Gansu Provincial Hospital, No.204 West Donggang Road, Lanzhou, 730000, Gansu Province, China
- Key Laboratory of Cerebrovascular Disease of Gansu Province, Gansu Provincial Hospital, Lanzhou, Gansu, China
| | - Shijie Yang
- The First Clinical Medical College of Lanzhou University, Lanzhou, China
| | - HeCheng Chen
- Cerebrovascular Disease Department, Gansu Provincial Hospital, No.204 West Donggang Road, Lanzhou, 730000, Gansu Province, China.
- Key Laboratory of Cerebrovascular Disease of Gansu Province, Gansu Provincial Hospital, Lanzhou, Gansu, China.
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Al-Kaif LAIK, Al-Ameri H, Alfatlawi WRO, Mahdi AE, Al-Khafaji YAK, Al-Saadi MAK, Al-Charrakh AH, Al-Mammori RT, Akkaif MA. Detection of CTLA-4 level and humeral immune response after the second dose of COVID-19 vaccine in certain Iraqi provinces participants. PLoS One 2024; 19:e0296521. [PMID: 38180994 PMCID: PMC10769031 DOI: 10.1371/journal.pone.0296521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 12/14/2023] [Indexed: 01/07/2024] Open
Abstract
BACKGROUND Evaluating immune responses following COVID-19 vaccination is paramount to understanding vaccine effectiveness and optimizing public health interventions. This study seeks to elucidate individuals' immune status after administering a second dose of diverse COVID-19 vaccines. By analyzing immune responses through serological markers, we aim to contribute valuable insights into the uniformity of vaccine performance. METHODS A total of 80 participants were enrolled in this study, with demographic and COVID-19 infection-related data collected for categorization. Serum samples were acquired within a specified timeframe, and SARS-CoV-2 IgM/IgG rapid tests were conducted. Moreover, CTLA-4 levels were measured through ELISA assays, allowing us to assess the immune responses comprehensively. The participants were divided into eight groups based on various factors, facilitating a multifaceted analysis. RESULTS The outcomes of our investigation demonstrated consistent immune responses across the diverse types of COVID-19 vaccines administered in Iraq. Statistical analysis revealed no significant distinctions among the vaccine categories. In contrast, significant differences were observed in CTLA-4 among the control group (non-infected/non-vaccinated, infected/non-vaccinated) and infected/Pfizer, non-infected/Pfizer, and infected/Sinopharm, non-infected/sinopharm (P = 0.001, < 0.001, 0.023, respectively). This suggests that these vaccines exhibit comparable effectiveness in eliciting an immune response among the study participants. CONCLUSIONS In conclusion, our study's results underscore the lack of discriminatory variations between different COVID-19 vaccine types utilized in Iraq. The uniform immune responses observed signify the equitable efficacy and performance of these vaccines. Despite minor quantitative discrepancies, these variations do not hold statistical significance, reaffirming the notion that the various vaccines serve a similar purpose in conferring protection against COVID-19.
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Affiliation(s)
- Laith A. I. K. Al-Kaif
- Department of Medical Microbiology, Hammurabi College of Medicine, University of Babylon, Hillah, Babylon, Iraq
- Department of Medical Laboratory Techniques, Al-Mustaqbal University, Hillah, Babylon, Iraq
| | - Hussain Al-Ameri
- Department of Medical Laboratory Techniques, Al-Mustaqbal University, Hillah, Babylon, Iraq
| | | | - Ammar Eesa Mahdi
- Basic Science Department, College of Dentistry, University of Babylon, Hillah, Babylon, Iraq
| | | | | | - Alaa H. Al-Charrakh
- Basic Science Department, College of Dentistry, University of Babylon, Hillah, Babylon, Iraq
| | | | - Mohammed Ahmed Akkaif
- Department of Cardiology, Qingpu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China
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Wang W, Wang H, Yao T, Li Y, Yi L, Gao Y, Lian J, Feng Y, Wang S. The top 100 most cited articles on COVID-19 vaccine: a bibliometric analysis. Clin Exp Med 2023; 23:2287-2299. [PMID: 36939968 PMCID: PMC10026222 DOI: 10.1007/s10238-023-01046-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 03/07/2023] [Indexed: 03/21/2023]
Abstract
This study aimed to uncover the current major topics regarding COVID-19 vaccine, and systematically evaluate the development trends for future research. The top 100 most cited original articles on COVID-19 vaccine from January 2020 to October 2022 were identified from Web of Science Core Collection database. CiteSpace (v6.1.R3) was adopted for bibliometric analysis with statistical and visual analysis. The number of citations ranged from 206 to 5881, with a median of 349.5. The USA (n = 56), England (n = 33), and China (n = 16) ranked the top three countries/regions in terms of the number of publications. Harvard Medical School (centrality = 0.71), Boston Children's Hospital (centrality = 0.67), and Public Health England (centrality = 0.57) were the top three institutions leading the way on COVID-19 vaccine research. The New England of medicine journal dominated with 22 articles in the 32 high-quality journals. The three most frequent keywords were immunization (centrality = 0.25), influenza vaccination (centrality = 0.21), and coronavirus (centrality = 0.18). Cluster analysis of keywords showed that the top four categories were protection efficacy, vaccine hesitancy, spike protein, and second vaccine dose (Q value = 0.535, S value = 0.879). Cluster analysis of cited references showed that top eight largest categories were Cov-2 variant, clinical trial, large integrated health system, COV-2 rhesus macaque, mRNA vaccine, vaccination intent, phase II study, and Cov-2 omicron variant (Q value = 0.672, S value = 0.794). The research on COVID-19 vaccine is currently the hottest topic in academic community. At present, COVID-19 vaccines researches have focused on vaccine efficacy, vaccine hesitancy, and the efficacy of current vaccines on omicron variants. However, how to increase vaccine uptake, focus on mutations in the spike protein, evaluate of the efficacy of booster vaccine, and how effective new vaccines under pre- and clinical development against omicron will be spotlight in the future.
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Affiliation(s)
- Weigang Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Shanxi Province Cancer Hospital, Taiyuan, China
| | - Hu Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Tian Yao
- First Hospital/First Clinical Medical College of Shanxi Medical University, Taiyuan, China
| | - Yandi Li
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Linzhu Yi
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Ying Gao
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Jia Lian
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Yongliang Feng
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
| | - Suping Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001 Shanxi China
- Center of Clinical Epidemiology and Evidence Based Medicine, Shanxi Medical University, Taiyuan, China
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Yilmaz Hanci S. Evaluation of the 101 most cited immunology articles: A bibliometric analysis. Medicine (Baltimore) 2023; 102:e34375. [PMID: 37478253 PMCID: PMC10662843 DOI: 10.1097/md.0000000000034375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 06/27/2023] [Indexed: 07/23/2023] Open
Abstract
In our study, the 101 most cited publications in the field of "Immunology" in the Web of Science (WoS) database were evaluated bibliometrically. The "WoS" database "advanced mode" was used in this study. A search was conducted in the field of "Immunology." The top 101 most-cited publications were then identified. The total number of citations of the publications, annual number of citations, authors, information of the study, and journal were analyzed. There were 1,191,384 publications in the field of "Immunology" in the WoS between 1975 and 2023. The total citation average of the 101 most cited publications was 3765.69 ± 4142.7 and the annual citation average was 180.91 ± 133.1. The first 3 subjects in the first 101 articles were listed as "apoptosis-cancer immunology" (14.85%), "monocyte-macrophage"(14.58%), and "T-cell"(13.86%), respectively. The 3 journals in which the studies were published the most were determined as "Annual Review of Immunology" (18.81%), "Nature Reviews Immunology" (17.82%) and "Nature Immunology" (10.89%). Only 1.98% of publications were published after 2014. A significant relationship was found between the study type, impact factor of the journal, continent of journal and publisher, funding status, year of publication, and number of citations per year (P < .05). Our study is the first to analyze the top 101 most-cited studies in the field of "immunology" and their citation characteristics. The study's journals, publishers, publication features, funding status, and publication year affect the number of citations per year.
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Affiliation(s)
- Sevgi Yilmaz Hanci
- Microbiology and Clinical Microbiology Laboratory, Health Sciences University, İzmir Tepecik Training and Research Hospital, Izmir, Turkey
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Liu Z, Li Z, Meng Q, Gu Z, Cui J. Bibliometric Analysis of Global Research Landscape and Hotspots on Dysmenorrhea: Where are We Now? J Pain Res 2023; 16:269-285. [PMID: 36744113 PMCID: PMC9891078 DOI: 10.2147/jpr.s396083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/04/2023] [Indexed: 02/07/2023] Open
Abstract
Purpose Dysmenorrhea is the most common gynecological condition among women of childbearing age and remains a challenging public health issue. This study aimed to visualize profiles and hotspots in dysmenorrhea research through a bibliometric analysis to deepen the understanding of knowledge in this field. Methods Articles and reviews on dysmenorrhea published from 2000 to 2021 were collected. We summarized standard bibliometric indicators. Publications were systematically assessed in terms of country, institution, author, journal, reference, and keywords using Citespace, VOSviewer, Bibliometric, and an online platform. Besides, correlation analyses of country-specific characteristics and bibliometric indicators were performed. Results 3407 publications were included. Dysmenorrhea-related publications have been increasing steadily annually. China and the United States were the most productive and academically influential countries, respectively. Correlation analysis revealed that economic power is an essential factor influencing scientific activity. However, collaboration in dysmenorrhea research remained weak. Natl Yang Ming Univ and Vercellini P were the most productive institution and influential author, respectively. A significant proportion of dysmenorrhea research was published in high-impact journals and it was explored at a multidisciplinary level. Current research topics focus on two primary areas: (1) pathophysiology, such as pathogenesis, oxidative stress, and functional connectivity, and (2) public health impacts, such as quality of life, burden, depression, and exercise. Conclusion Dysmenorrhea research has received extensive attention from scholars and is rapidly evolving. Improved collaboration and interdisciplinary exploration may advance this field. Public health research and pathophysiological exploration of dysmenorrhea are current research hotspots and may also be a focus of research in the coming years.
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Affiliation(s)
- Zhihui Liu
- Department of Obstetrics and Gynecology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People’s Republic of China
| | - Zhuo Li
- School of Medicine, Nankai University, Tianjin, People’s Republic of China
| | - Qian Meng
- Department of Obstetrics and Gynecology, Zibo Maternal and Child Health Hospital, Zibo, People’s Republic of China
| | - Zhenpeng Gu
- Department of Obstetrics and Gynecology, Binzhou Medical University Hospital, Binzhou, People’s Republic of China
| | - Jinxiu Cui
- Department of Obstetrics and Gynecology, Binzhou Medical University Hospital, Binzhou, People’s Republic of China,Correspondence: Jinxiu Cui, Department of Obstetrics and Gynecology, Binzhou Medical University Hospital, No. 661 Huanghe 2nd Road, Binzhou, Shandong Province, 256603, People’s Republic of China, Email
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Li S, Zhao P, Wang C, Xia Y, Wang H, Qi W. Hotspots and Frontiers of Host Immune Response in Idiopathic Pulmonary Fibrosis: A Bibliometric and Scientific Visual Research from 2000 to 2022. J Immunol Res 2023; 2023:4835710. [PMID: 37124548 PMCID: PMC10132898 DOI: 10.1155/2023/4835710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 03/23/2023] [Accepted: 03/25/2023] [Indexed: 05/02/2023] Open
Abstract
Background Idiopathic pulmonary fibrosis (IPF) is a disease with significant morbidity, progressive deterioration of lung function till death, and lack of effective treatment options. This study aims to explore the global research trends in IPF and immune response to predict the research hotspot in the future. Materials and methods. All related publications on IPF and immune response since the establishment of diagnostic criteria for IPF were retrieved using the Web of Science (WOS) database. VOSviewer, GraphPad Prism 6, CiteSpace version 5.6. R5 64-bit, and a bibliometrics online platform were used to extract and analyze the trends in relevant fields. Results From March 1, 2000, to September 30, 2022, a total of 658 articles with 25,126 citations met the inclusion criteria. The United States ranked first in number of publications (n = 217), number of citations (n = 14,745), and H-index (62). China ranked second in publications (n = 124) and seventh and fifth for citation frequency and H-index, respectively. The American Journal of Respiratory and Critical Care Medicine (impact factor = 30.528) published the most articles in the field. The author Kaminski N. from the United States was the most influential author with 26 publications and an H-index of 24. Among the 52 keywords that co-occurred at least 20 times, the main keywords were concentrated in "Inflammation related" and "Biomarker related" clusters. "biomarker" (AAY 2018.64, 25 times) was a newly emerged keyword. Conclusions The United States has an unequivocal advantage in IPF and immunization, but China shows a faster developing trend. The American Journal of Respiratory and Critical Care Medicine should be prioritized for leading articles. This study indicates that exploration of ideal immune-related biomarkers to provide evidence for the clinical work of IPF might be a hotspot in the near future.
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Affiliation(s)
- Shirong Li
- Department of Infectious Disease, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Pengyue Zhao
- Department of General Surgery, First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - Chao Wang
- Department of Infectious Disease, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Yun Xia
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, Wuhan 430000, China
| | - Haoyan Wang
- Department of Respiratory, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Wenjie Qi
- Department of Infectious Disease, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
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Villasis-Keever MÁ, Escamilla-Núñez A, Durán-Muñoz CA, García H, Riojano-Mejía D, Miranda-Novales MG. [Bibliometric analysis of scientific publications on COVID-19 elaborated by staff of the Instituto Mexicano del Seguro Social]. REVISTA MEDICA DEL INSTITUTO MEXICANO DEL SEGURO SOCIAL 2022; 60:77-85. [PMID: 36795975 PMCID: PMC10651309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 10/20/2020] [Indexed: 02/18/2023]
Abstract
Background Since the beginning of the pandemic, new knowledge about COVID-19 obtained by research has been disseminated in medical and scientific journals, but the large number of publications that have been generated in such a short time has been impressive. Objective To perform a bibliometric analysis of the published articles in medical-scientific journals carried-out by the Mexican Social Security Institute (IMSS) personnel on COVID-19. Material and methods Systematic review of the literature, identifying the publications included in the PubMed and EMBASE databases, up to September 2022. Articles on COVID-19 were included, in which at least one author had IMSS affiliation; there was no restriction on the type of publication, so original articles, review articles, clinical case reports, etc. were included. The analysis was descriptive. Results 588 abstracts were obtained, of which 533 full length articles met the selection criteria. Most were research articles (48%), followed by review articles. Mainly clinical or epidemiological aspects were addressed. They were published in 232 different journals, with a predominance of foreign journals (91.8%). Around half of the publications were carried out by IMSS personnel together with authors from other institutions, national or foreign. Conclusions The scientific contributions prepared by IMSS personnel have contributed to understanding clinical, epidemiological and basic aspects of COVID-19, which has had an impact on improving the quality of care for its beneficiaries.
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Affiliation(s)
- Miguel Ángel Villasis-Keever
- Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Unidad de Investigación en Análisis y Síntesis de la Evidencia. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
| | - Alberto Escamilla-Núñez
- Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Unidad de Investigación en Análisis y Síntesis de la Evidencia. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
| | - Carlos Alberto Durán-Muñoz
- Instituto Mexicano del Seguro Social, Coordinación de Investigación en Salud, División de Desarrollo de la Investigación. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
| | - Heladia García
- Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Unidad de Investigación en Análisis y Síntesis de la Evidencia. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
| | - David Riojano-Mejía
- Instituto Mexicano del Seguro Social, Coordinación de Investigación en Salud, División de Desarrollo de la Investigación. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
| | - María Guadalupe Miranda-Novales
- Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Unidad de Investigación en Análisis y Síntesis de la Evidencia. Ciudad de México, MéxicoInstituto Mexicano del Seguro SocialMéxico
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