ORIGINAL ARTICLE Year : 2022  |  Volume : 9  |  Issue : 3  |  Page : 123-128

Bibliometric studies of most-cited medical papers: A bibliometric analysis

Masoud Motalebi Kashani1, Hoda Homavandi2, Zahra Batooli3
1 Social Determinants of Health Research Center, Kashan University of Medical Sciences, Kashan, Iran
2 PhD in Knowledge and Information Science, Kashan, Iran
3 Social Determinants of Health Research Center, Faculty of Health, Kashan University of Medical Sciences, Kashan, Iran

Date of Submission29-May-2022Date of Decision24-Jul-2022Date of Acceptance30-Jul-2022Date of Web Publication11-Apr-2023

Correspondence Address:
Dr. Zahra Batooli
Social Determinants of Health Research Center, Faculty of Health, Kashan University of Medical Sciences, Kashan
Iran

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/iahs.iahs_103_22

Aims: The purpose of this study is the analysis of bibliometric studies of the medical most-cited papers. Materials and Methods: This applied and the scientometric study was conducted using retrospective bibliometric analysis methods. A Scopus search was conducted and 883 articles were retrieved. After reviewing the titles and abstracts, 432 articles related to the purpose of this research were identified. Items such as year, journal, country, and institution were considered. Medical subject heading and NLM were applied for the subject categorization of articles. Given the dynamics of subject areas over time, only the content of 117 articles published in 2020 and 2021 were analyzed. These 117 articles have been reviewed with 11,700 most-cited articles. By reviewing 117 articles, the most productive journal, country, and institute in producing 11,700 articles were identified. Results: The findings have shown a significant number of these publications review 100 most-cited articles in the field of medicine. Articles pertaining to the Nervous System, Musculoskeletal System, Dentistry, Radiology, and Cardiovascular System are the most numerous among the publications. Conclusion: The results of this study allow readers to know the most productive countries, institutions, and journals of various subject areas, as well as the most influential fields and research trends in that subject area. The results of this study also identify subject areas for which the characteristics of their core articles have not yet been explored to plan future research.

Keywords: Bibliometric, biomedical research, medicine in literature

How to cite this article:
Kashani MM, Homavandi H, Batooli Z. Bibliometric studies of most-cited medical papers: A bibliometric analysis. Int Arch Health Sci 2022;9:123-8
  Introduction 

Quantitative and qualitative evaluation of scientific and research findings helps authorities, stakeholders, and government to efficiently use human and financial resources and optimize the socioeconomic structure of the societies. Therefore, financial and organizational planning of the research system requires the evaluation of research activities through scientometric methods.[1] In addition, the study of scientific production provides an efficient tool for appropriate policymaking and planning by having a clear view of past scientific research. As a result, it leads to making purposeful scientific activities, setting research priorities, and identifying weaknesses and deficiencies in the production of scientific information.[2] One of the most effective ways to study the scientific output and particularly the general state of the research, is to review the articles indexed in reliable and trusted databases. In this type of study, the quantitative assessment of scientific production can partly determine the contribution made by each country, institution, scientific discipline, researcher, and its process in different subject areas.

Moreover, citation analysis is regarded as an integral component of current scientometric research as well as a crucial indicator. The number of citations received affects the impact factor of the journal in which the article is published and also identifies the credibility, impact, quality, or reputation of the article and the authors who have contributed to the article.[3],[4],[5],[6] It is obvious that the most-cited articles are considered a turning point in all subject areas and can specifically affect research and clinical procedures. One hundred most-cited articles in each subject area are regarded as the most influential articles in that area. Scientometric analysis of the most influential articles in each subject area contributes to enhancing our knowledge of the studies, topics, and research trends of each subject domain. This type of analysis, which has received special attention in recent years, represents the procedure of dissemination, evolution of knowledge, and evidence-based performance of subject or field over several years. A collection of the most-cited articles can help specialists in each field better understand the nature of subject areas. Although the number of citations received by a publication is not a measurement of quality, it is used to measure the impact of the article on the scientific community so that high-quality research would lead to more citations than low-quality research.[7] Due to the importance of addressing this issue in recent years, several studies have been conducted in connection with the review of 100 most-cited articles in various subject areas, which reveals the need to pay more attention to this type of research. Therefore, considering the increasing applications of the scientometric method in evaluating and measuring the scientific productions of researchers, the purpose of this study is the analysis of bibliometric studies of medical most-cited papers. The results of this study provide the readership with in-depth insights into the subject area by acquainting them with the leading authors, countries, institutions, and journals of different subject areas, as well as the influential subjects and research trends of each field. The results of this study also point out subject areas for which the characteristics of their core publications have not yet been explored to plan future research.

  Materials and Methods 

The purpose of this study is the analysis of bibliometric studies of the medical most-cited papers in different subject areas in the Scopus database. This applied and scientometric study was conducted using Retrospective Bibliometric Analysis methods. In the TITLE-ABS field, the search keywords include (100 OR hundred) and (cited OR citation) were combined with the “W/5” proximity operator on February 18, 2021, and 883 records were retrieved. After reviewing these records, 432 articles related to the purpose of this research were identified and analyzed. Then, Medical Subject Heading (MeSH) (https://www.ncbi.nlm.nih.gov/mesh/) was used in order to categorize articles in the field of medical sciences, and NLM Classification (https://classification.nlm.nih.gov) was utilized to categorize articles thematically. MeSH is a controlled and hierarchically-organized vocabulary produced by the National Library of Medicine. It is used for indexing, cataloging, and searching of biomedical and health-related information. NLM Classification is a product of the National Library of Medicine for the arrangement of library materials in the field of medicine and related sciences used internationally. The one-or two-letter alphabetical codes in the NLM classification use a limited range of letters: only QS–QZ and W–WZ. The headings for the individual schedules are given in brief form (e.g., QW-Microbiology and Immunology; WG-Cardiovascular System), and together, they provide an outline of the subjects covered by the NLM classification.

Given the dynamics of subject areas over time, only the content of 117 articles published in 2020 and 2021 were analyzed. These 117 articles have been reviewed in 11,700 most-cited articles in various subject areas of medical sciences. By reviewing 117 articles, the most productive journal, country, and institute in producing 11,700 articles were identified [Figure 1].

  Results 

The results showed that 432 articles have reviewed and analyzed 100 most-cited articles in various subject areas. The number of published articles has increased from 1987 to 2021. Findings showed that about half of the articles (47.46%) were published between 2019 and 2021. In terms of institutions, The University of British Columbia and Hallym University were found to be the most productive institution, with 15 and 14 articles, respectively. In terms of country, 118 articles originate from the United States. The results showed that 432 articles were published in 318 journals. World Neurosurgery and Medicine (United States) published the most articles, with 20 and 12, respectively. The results showed that 432 analyzed articles have been cited 5429 times. The average number of citations to nonzero events is 16.

In terms of the subject area, a significant number of articles reviewed the top 100 articles in the field of medical sciences. These Articles were categorized using MeSH and NLM Classification. [Figure 2] shows these articles based on subject category.

As can be concluded from [Figure 2], the WL schedule (Nervous System) and WE schedule (Musculoskeletal System) were ranked first and second, respectively. There are also 35 articles on the WU schedule (Dentistry and Oral Surgery).

Given the dynamics of subject areas over time, only the content of 117 articles published in 2020 and 2021 were analyzed. These 117 articles have been reviewed 11,700 most-cited articles in various subject areas of medical sciences. By reviewing 117 articles, the most productive journal, country, and institute in producing 11,700 articles were identified. The results showed that the New England Journal of Medicine, the Journal of Neurosurgery, and the Journal of Clinical Oncology have been introduced as journals with the most contribution [Figure 3].

According to [Figure 3], The Journal of Urology and the Lancet have been identified as the next most productive journals. [Figure 4] shows the most productive countries in publishing 100 most-cited articles.

As [Figure 4] shows, The USA is the most productive country in terms of publishing articles in various subject areas with 108 articles. Regarding the most productive institution/university, the results showed that the University of Cambridge, Harvard University, Mayo Clinic, University of Michigan, and the University of Toronto have been the largest contributors in publishing the most-cited articles.

  Discussion 

The purpose of this study is to review 432 articles that have analyzed 100 most-cited studies in various subject areas. These articles were published between 1978 and 2020. The number of published articles has been increasing over the past years, and about half of these articles (205 articles) have been published between 2019 and 2021. Furthermore, the number of published articles has grown rapidly since 2012, with only 6% of them published before 2012. These results indicate that in recent years, the analysis of the most-cited articles in various subject areas has attracted researchers' attention. The first article is a study by Garfield, E., which analyzed the 100 most-cited articles in The Journal of the American Medical Association and was published in this journal in 1987.[8] The results showed that the average number of citations to nonzero events is 16. The most-cited study is an article that analyzed 100 most-cited articles published in journals related to “general surgical.” This article was published in 2002 in the World Journal of Surgery and received 281 citations.[3] This article also ranks third in terms of citation density. The article that analyzed the most-cited studies in the “Building Information Modeling” field ranks first in terms of citation density and 7th in terms of receiving citations (118 citations).[9] Top-ranked articles in terms of citation density have often been published in recent years. This result indicates an increase in the quality of recently published articles, so much so that they have been able to receive more citations in a short period of time. One hundred and fifty-nine authors have contributed to the publishing of these articles. The finding showed that the most productive authors were mostly from the Departments of Neurology and Radiology. Yoon, Daeyoung from Hallym University (h-index 21), and Khosa, Faisal from the University of British Columbia (h-index 22) were ranked first and second, respectively, in terms of contribution to the publication of these articles. Among the most-cited articles authored by Yoon and Daeyoung are articles that have analyzed the 100 most-cited articles on Neuroimaging,[10] Headache Disorders,[11] and Neurointervention.[12] Moreover, an article by Yoon analyzed the 100 most-cited articles in 12 journals of radiology[13] published in 2013 and received 65 citations. Khosa and Faisal have analyzed the most-cited studies in the fields such as Radiology of Trauma,[14] Cardiac Computed Tomography,[15] Cardiovascular Magnetic Resonance.[16] In terms of organizational affiliation, authors from the University of British Columbia and Hallym University were ranked first and second with 15 and 14 articles, respectively. The results showed that 432 articles were published in 318 journals. More than 20% of the articles have been published in 19 journals, among which 7 journals were with CiteScore Quartile 1 and 7 with CiteScore Quartile 2. The journal World Neurosurgery, published by Elsevier, was ranked first with 20 articles published in it. Fifty-five countries contributed to the publication of 432 reviewed articles. The United States was the most productive, ranking first with 118 articles. The results revealed that more than half of these articles were published by the contributions made by four countries, including the USA, China, the UK, and Canada. According to the Scopus subject classification, 432 articles have been published in 25 subject areas. Medicine has the largest number of articles, with 336 articles, while a significant percentage of the articles are related to other medical subjects, such as Dentistry, Neuroscience, Health Professions, and Nursing.

Some of these articles review and analyze 100 most-cited articles published in a particular journal. These studies analyzed articles published by the Journal of the American Medical Association,[8] Medical Journal Armed Forces India,[17] Journal of Dental Research,[18] Environmental Research Letters.[19] Some articles have been reviewed articles in journals of a specific subject category, including Core Dental Public Health,[20] Prosthodontic,[21] Knowledge Management,[22] Emergency Medicine,[23] Radiology,[24] Paediatric Dentistry,[25] Allergy,[26] Primary Health Care,[27] and General Medical.[28]

Some of these articles reviewed articles from a specific country. For instance, there is a study that has analyzed 100 most-cited articles in Turkey in 40 orthopedic journals.[29] Other studies have analyzed Turkish articles on Respiratory systems[30] and Abdominal Wall Hernias.[31] Another article reviews the 100 most-cited articles published in dental journals by at least one author from Brazil.[32] Furthermore, a study has reviewed and analyzed articles from India and China.[33] A study also analyzed 100 most-cited medical and surgical articles published in the journals of the Republic of Ireland or Northern Ireland.[34] Some of these articles also review specific types of articles. A study analyzed 100 most-cited systematic reviews and meta-analysis articles.[35] There are also studies that reviewed 100 most-cited Randomized Controlled Trials, Systematic Reviews, and Meta-Analysis articles published in journals of a specific subject category such as Endodontic[36] and Dentistry.[37]

Most of the 432 reviewed articles have analyzed 100 most-cited articles in a specific subject area, of which medical science has attracted the focus of a significant percentage of these articles and only 37 articles analyzed other areas. Most of the articles that analyzed the 100 most-cited articles in medical science dealing with the Nervous System and Musculoskeletal System subject categories. The nervous system includes subjects such as Skull Base Neurosurgery,[38] Spinal Deformity Surgery,[39] Pediatric Traumatic Brain Injury,[40] Traumatic Spinal Cord Injury,[41] and Brain Metastases.[42] Subjects such as Hip And Knee Arthroplasty[43] and Back Pain[44] are also related to the Musculoskeletal System. Dentistry and Oral Surgery, Radiology, Surgery, and Cardiovascular System are also in the next ranks in terms of the number of articles. The review of most-cited articles pertaining to oral and dental fields, including Dental Caries,[45] Dental Stem Cells,[46] Endodontics,[47] and Oral Leukoplakia[48] has also attracted the attention of many researchers. The results showed that most of the medical articles focused on Medicine and Related Subjects, and a small percentage of the articles has analyzed topics related to Preclinical Sciences. Among the subject categories related to Preclinical Sciences, OW, OV, and QZ have the largest number of articles. These articles are related to Pathology, Pharmacology, Microbiology, and Immunology. The analysis of the most-cited articles in the area of the History of Medicine, Geriatrics, Nursing, Hemic and Lymphatic Systems, Medicine in Selected Environments, Parasitology, Anatomy, and Physiology has received less attention from researchers.

To further analyze the content of these studies, out of 432 reviewed articles, 117 were selected. The reason for selecting these articles is their publication in 2020 and 2021 and their focus on analyzing the most-cited medical sciences articles. The results showed that the 100 most-cited studies reviewed in these 117 articles were mostly retrieved from WoS and Scopus citation databases.

The results of bibliographic analyses, such as the most productive author, journal, institute, and country in each subject area, are presented in Supplement 1. Out of 18 journals that have been introduced in more than four studies as the most productive journals in publishing 100 most-cited articles in different subject areas, 17 journals are Q1 based on impact factor, and all 18 journals are Q1 based on the CiteScore index. The results showed that the New England Journal of Medicine, the Journal of Neurosurgery, and the Journal of Clinical Oncology were introduced as the most productive journals in publishing most-cited articles in various subject areas. According to the IF and SJR index, “The New England Journal of Medicine” was ranked first (IF = 74.699 and SJR = 18.291), and in terms of CiteScore and SNIP index, “Lancet” was ranked first (CiteScore index = 73.4 and SNIP = 21.313). Based on H-Index, “Nature” and “Science” were ranked first and second with 1159 and 1124, respectively. The USA contributed 108 studies and is considered the most productive country thanks to its publication of articles on various subject areas; therefore, among 101 articles, the United States ranks first in terms of publishing 100 most-cited articles.

  Conclusion 

A review of research that has analyzed the bibliographic information of 100 most-cited articles in various subject areas can provide valuable information to researchers in these subject areas. Researchers and experts can use the results of this research to recognize the most productive authors, journals, countries, and institutions in publishing high-quality articles in various subject areas. Moreover, the analysis carried out in the mentioned articles covered the subjects that have received the most attention in the most-cited articles in the field. Knowing these areas of research can be used to determine research priorities because these subjects have been able to receive more citations as well as more attention from researchers in that field. Furthermore, the result of this research was able to identify subject areas that have not been researched in connection with the analysis of the most-cited articles.

Financial support and sponsorship

The Vice Chancellor for Research of Kashan University of Medical Sciences, Kashan, Iran, granted this study, with No. 98000617 (IR.KAUMS.NUHEPM.REC.1400.023).

Conflicts of interest

There are no conflicts of interest.

 

  References 
1.Aminpour F, Kabiri P, Naji H. Isfahan University of Medical Sciences: Two decades of scientific achievements. Iran J Med Educ 2008;8:164-73.  
    2.Bazrafshan A, Mostafavi E. A scientometric overview of 36 years of scientific productivity by Pasteur Institute of Iran in ISI SCIE. J Health Adm 2011;14:7-10.  
    3.Paladugu R, Schein M, Gardezi S, Wise L. One hundred citation classics in general surgical journals. World J Surg 2002;26:1099-105.  
    4.Moed HF. New developments in the use of citation analysis in research evaluation. Arch Immunol Ther Exp (Warsz) 2009;57:13-8.  
    5.Joyce CW, Kelly JC, Carroll SM. The 100 top-cited classic papers in hand surgery. J Plast Surg Hand Surg 2014;48:227-33.  
    6.Shuaib W, Khan MS, Shahid H, Valdes EA, Alweis R. Bibliometric analysis of the top 100 cited cardiovascular articles. Am J Cardiol 2015;115:972-81.  
    7.Bornmann L, Daniel HD. What do citation counts measure? A review of studies on citing behavior. J Doc 2008;64:45-80.  
    8.Garfield E. 100 citation classics from the Journal of the American Medical Association. JAMA 1987;257:52-9.  
    9.Santos R, Costa AA, Grilo A. Bibliometric analysis and review of Building Information Modelling literature published between 2005 and 2015. Autom Constr 2017;80:118-36.  
    10.Kim HJ, Yoon DY, Kim ES, Lee K, Bae JS, Lee JH. The 100 most-cited articles in neuroimaging: A bibliometric analysis. Results Phys 2016;139:149-56.  
    11.ark KM, Park BS, Park S, Yoon DY, Bae JS. Top-100 cited articles on headache disorders: A bibliometric analysis. Clin Neurol Neurosurg 2017;157:40-5.  
    12.Kim ES, Yoon DY, Kim HJ, Jeon HJ, Lee JY, Cho BM, et al. Citation classics in neurointerventional research: A bibliometric analysis of the 100 most cited articles. J Neurointerv Surg 2017;9:508-11.  
    13.Yoon DY, Yun EJ, Ku YJ, Baek S, Lim KJ, Seo YL, et al. Citation classics in radiology journals: The 100 top-cited articles, 1945-2012. AJR Am J Roentgenol 2013;201:471-81.  
    14.Dolan RS, Hanna TN, Warraich GJ, Johnson JO, Khosa F. The top 100 articles in the radiology of trauma: A bibliometric analysis. Emerg Radiol 2015;22:667-75.  
    15.O'Keeffe ME, Hanna TN, Holmes D, Marais O, Mohammed MF, Clark S, et al. The 100 most-cited original articles in cardiac computed tomography: A bibliometric analysis. J Cardiovasc Comput Tomogr 2016;10:414-23.  
    16.Khan MS, Ullah W, Riaz IB, Bhulani N, Manning WJ, Tridandapani S, et al. Top 100 cited articles in cardiovascular magnetic resonance: A bibliometric analysis. J Cardiovasc Magn Reson 2016;18:87.  
    17.Maurya RK, Datana S, Verma S, Kumar Bhandari S. Correlation between scientometrics and altmetrics score of scholarly literature of Medical Journal Armed Forces India. Med J Armed Forces India 2022;78:S123-32.  
    18.Ahmad P, Alam MK, Jakubovics NS, Schwendicke F, Asif JA. 100 years of the journal of dental research: A bibliometric analysis. J Dent Res 2019;98:1425-36.  
    19.Caldeira K. ERL and the impact of small groups of authors. Environ Res Lett 2016;11:120204.  
    20.Mattos FF, Perazzo MF, Vargas-Ferreira F, Martins-Júnior PA, Paiva SM. Top 100 most-cited papers in core dental public health journals: Bibliometric analysis. Community Dent Oral Epidemiol 2021;49:40-6.  
    21.Praveen G, Chaithanya R, Alla RK, Shammas M, Abdurahiman VT, Anitha A. The 100 most cited articles in prosthodontic journals: A bibliometric analysis of articles published between 1951 and 2019. J Prosthet Dent 2020;123:724-30.  
    22.Serenko A, Dumay J. Citation classics published in knowledge management journals. Part III: Author survey. J Knowl Manag 2017;21:330-54.  
    23.Shao JF, Zheng XT. The 100 top-cited articles published in emergency medicine journals: A bibliometric analysis. Hong Kong J Emerg Med 2016;23:329-39.  
    24.Yaxley KL, To MS. The 100 top-cited meta-analyses of diagnostic accuracy in radiology journals: A bibliometric analysis. Insights Imaging 2020;11:123.  
    25.Perazzo MF, Otoni AL, Costa MS, Granville-Granville AF, Paiva SM, Martins-Júnior PA. The top 100 most-cited papers in Paediatric Dentistry journals: A bibliometric analysis. Int J Paediatr Dent 2019;29:692-711.  
    26.Zhang Y, Quan L, Du L. The 100 top-cited articles in main allergy journals: A bibliometric analysis. Iran J Allergy Asthma Immunol 2019;18:688-700.  
    27.Li H, Zhao X, Zheng P, Hu M, Lu Y, Jia F, et al. Classic citations in main primary health care journals: A PRISMA-compliant systematic literature review and bibliometric analysis. Medicine (Baltimore) 2015;94:e2219.  
    28.Ahmad SJ, Ahmed AR, Kowalewski KF, Nickel F, Rostami K, Stocker CJ, et al. Citation classics in general medical journals: Assessing the quality of evidence; a systematic review. Gastroenterol Hepatol Bed Bench 2020;13:101-14.  
    29.Gürbüz Y, Süğün TS, Özaksar K. A bibliometric analysis of orthopedic publications originating from Turkey. Acta Orthop Traumatol Turc 2015;49:57-66.  
    30.Yıldız P. The analysis of the top 100 most cited publications in chest diseases in Turkey (1975-2019): A bibliometric analysis. Tuberk Toraks 2020;68:81-95.  
    31.Kulaçoğlu H, Celasin H. Most cited 100 articles from Turkey on abdominal wall hernias: A bibliometric study. Turk J Surg 2020;36:180-91.  
    32.Gonçalves AP, Plá AL, Rodolfo B, Nahsan FP, Correa MB, Moraes RR, et al. Top-100 most cited dental articles with authors from Brazil. Braz Dent J 2019;30:96-105.  
    33.Madhan M, Chandrasekar G, Arunachalam S. Highly cited papers from India and China. Curr Sci 2010;99:738-49.  
    34.Clifford SM, Akhtar AM, Redmond CE, Hutchinson Z, Al-Sayyed H, Browne E, et al. The 100 citation classics in the Irish medical literature; a bibliometric analysis. Ir Med J 2020;113:125.  
    35.Uthman OA, Okwundu CI, Wiysonge CS, Young T, Clarke A. Citation classics in systematic reviews and meta-analyses: Who wrote the top 100 most cited articles? PLoS One 2013;8:e78517.  
    36.Ahmad P, Dummer PM, Chaudhry A, Rashid U, Saif S, Asif JA. A bibliometric study of the top 100 most-cited randomized controlled trials, systematic reviews and meta-analyses published in endodontic journals. Int Endod J 2019;52:1297-316.  
    37.Gogos C, Kodonas K, Fardi A, Economides N. Top 100 cited systematic reviews and meta-analyses in dentistry. Acta Odontol Scand 2020;78:87-97.  
    38.Khan NR, Lee SL, Brown M, Reding J, Angotti J, Lepard J, et al. Highly cited works in skull base neurosurgery. World Neurosurg 2015;83:403-18.  
    39.Skovrlj B, Al Maaieh M, Guzman J, Caridi J, Cho SK. The 100 classic papers in spinal deformity surgery. Spine Deform 2014;2:241-7.  
    40.Karydakis P, Giakoumettis D, Themistocleous M. The 100 most cited papers about pediatric traumatic brain injury: A bibliometric analysis. Ir J Med Sci 2020;189:315-25.  
    41.Jani RH, Prabhu AV, Zhou JJ, Alan N, Agarwal N. Citation analysis of the most influential articles on traumatic spinal cord injury. J Spinal Cord Med 2020;43:31-8.  
    42.Panagopoulos D, Karydakis P, Giakoumettis D, Themistocleous M. The 100 most cited papers about brain metastases. World Neurosurg 2020;138:98-114.  
    43.Piuzzi NS, Sultan AA, Gatta J, Ng M, Cantrell WA, Khlopas A, et al. Top 100 most-cited clinical studies of hip and knee arthroplasty: The foundation of practice. Orthopedics 2019;42:e151-61.  
    44.Fan G, Han R, Zhang H, Zhou Z, He S, Chen Z. Top 100 most-cited articles in low back pain: A 22-year survey of publication activity. Int J Clin Exp Med 2016;9:648-57.  
    45.Arshad AI, Ahmad P, Dummer PM, Alam MK, Asif JA, Mahmood Z, et al. Citation classics on dental caries: A systematic review. Eur J Dent 2020;14:128-43.  
    46.Sengupta N, Sarode SC, Viswanathan V, Sarode GS, Patil SS, Gadbail AR, et al. Bibliometric analysis of the 100 most cited articles on dental stem cells. World J Dent 2020;11:274-83.  
    47.Ordinola-Zapata R, Peters OA, Nagendrababu V, Azevedo B, Dummer PM, Neelakantan P. What is of interest in Endodontology? A bibliometric review of research published in the International Endodontic Journal and the Journal of Endodontics from 1980 to 2019. Int Endod J 2020;53:36-52.  
    48.Liu W, Zhang Y, Wu L, Yang X, Shi L. Characteristics and trends of oral leukoplakia research: A bibliometric study of the 100 most cited articles. Medicine (Baltimore) 2019;98:e16293.  
    
  [Figure 1], [Figure 2], [Figure 3], [Figure 4]