Top 100 most-cited articles on tau protein: a bibliometric analysis and evidence mapping

Background

Tau, a microtubule-associated protein extensively distributed within the central nervous system (CNS), exhibits close associations with various neurodegenerative disorders. Here, we aimed to conduct a qualitative and quantitative bibliometric study of the top 100 most-cited publications on tau protein and reveal the current research hotspots and future perspectives.

Methods

The relevant literature was retrieved from the Web of Science Core Collection. CiteSpace (v6.2.R4) and VOSviewer (1.6.19) were adopted for bibliometric analysis with statistical and visual analysis.

Results

Citations per article ranged from 615 to 3,123, with a median number of 765.5 times. "Neuroscience" emerged as the most extensively researched subject in this field. The USA has emerged as the leading country, with a publication record (n = 65), total citations (n = 66,543), strong centrality (0.29), and extensive international collaborations. Harvard University (n = 11) and the University of California, San Francisco (n = 11) were the top two institutions in terms of publications. Neuron dominated with 13 articles in the 37 high-quality journals. M. Goedert from the MRC Laboratory of Molecular Biology was the most productive (n = 9) and top co-cited (n = 179) author. The most frequently studied keywords were Alzheimer's disease (n = 38). Future research is anticipated to intensify its focus on the pathogenesis of various tau-related diseases, emphasizing the phosphorylation and structural alterations of tau protein, particularly in Alzheimer's disease.

Conclusion

The pathogenesis of various tau-related diseases, including the phosphorylation and structural alterations of the tau protein, will be the primary focus of future research, with particular emphasis on Alzheimer's disease as a central area of investigation.

What makes an orthopaedic paper highly citable? A bibliometric analysis of top orthopeadic journals with 10-year follow up

PURPOSE

To examine a series of papers from top ranked orthopaedic journals with respect to the number of citations over a 10-year observation period to identify factors that lead to high citation rates.

METHODS

The Web of Science database was consulted to identify all published papers from the first-year term of 2010 (January-May) from four top orthopaedic journals: AJSM, Arthroscopy, JBJS Am and KSSTA. The database was used to analyze and compare the papers with respect to their characteristics and citations up to 2019. Basic information for each paper was collected including the author, country, study type and average citations per year (ACY). The most (Top20%) and least (Bottom20%) frequently cited papers were identified and differences were extracted.

RESULTS

Five hundred sixteen papers were included with a total of 19,261 citations. Most of the published papers were from the United States (n = 245). On average, a paper received 37.3 citations over the 10-year observation period. The most cited paper was cited 322 times. The most cited study type was randomized controlled trial (RCT) (Ø80.8). The Top20% papers were cited 37 times more often than the Bottom20%. Among the Top20%, the largest group was cohort study (n = 20) followed by case series (n = 19). Among others, the number of authors, the number of keywords and the number of references significantly correlated with the number of citations (p < 0.001).

CONCLUSIONS

Factors influencing citation frequency were identified.

Radiology During the COVID-19 Pandemic: Mapping Radiology Literature in 2020

OBJECTIVES

Our aim was to assess articles published in the field of radiology, nuclear medicine, and medical imaging in 2020 and analyze the linkage of radiology-related topics with coronavirus disease 2019 (COVID-19) through literature mapping along with a bibliometric analysis for publications.

METHODS

We performed a search on the Web of Science Core Collection database for articles in the field of radiology, nuclear medicine, and medical imaging published in 2020. We analyzed the included articles using VOS viewer software, where we analyzed the co-occurrence of keywords, representing major topics discussed. Of the resulting topics, a literature map was created and linkage analysis was done.

RESULTS

A total of 24,748 articles were published in the field of radiology, nuclear medicine, and medical imaging in 2020. We found a total of 61,267 keywords; only 78 keywords occurred more than 250 times. COVID-19 had 449 occurrences, 29 links, with a total link strength of 271. MRI was the topic most commonly appearing in 2020 radiology publications, while "computed tomography" had the highest linkage strength with COVID-19, with a linkage strength of 149, representing 54.98% of the total COVID-19 linkage strength, followed by "radiotherapy, and "deep and machine learning". The top cited paper had a total of 1,687 citations. Nine out of the 10 most cited articles discussed COVID-19 and included "COVID-19" or "coronavirus" in their title, including the top cited paper.

CONCLUSION

While MRI was the topic that dominated, CT had the highest linkage strength with COVID-19 and represented the topic of top cited articles in 2020 radiology publications.

Publications on COVID-19 in radiology journals in 2020 and 2021: bibliometric citation and co-citation network analysis

OBJECTIVES

The pandemic caused by SARS-CoV-2 has led to the rapid publication of numerous radiology articles, primarily focused on disease diagnosis. The objective of this study is to analyze the intellectual structure of radiology research on COVID-19 using a citation and co-citation analysis.

METHODS

We identified all documents about COVID-19 published in radiology journals included in the Web of Science in the period 2020-2021, conducting a citation analysis. Then we identified all bibliographic references that were cited by these documents, generating a co-citation matrix that was used to perform a co-citation network.

RESULTS

Of the 3418 documents indexed in WoS, 857 were initially "Early Access," 2223 had citations, 393 had more than 20 citations, and 83 had more than 100 citations. The USA had the highest number of publications (32.62%) and China had the highest rate of funded studies (45.38%). The three authors with the most publications were affiliated with Italian institutions, while the five most cited authors were Chinese. A total of 647 publications were co-cited at least 12 times and were published in 206 different journals, with 49% of the documents found in radiology journals. The institutions with the greatest presence among these co-cited articles were Chinese and American.

CONCLUSION

This co-citation analysis is the first to focus exclusively on radiology articles on COVID-19. Our study confirms the existence of interrelated thematic clusters with different specific weights.

KEY POINTS

• As the pandemic caused by SARS-Cov-2 has led to the rapid publication of numerous radiology studies in a short time period, a bibliometric review based on citation and co-citation analysis has been conducted. • The co-citation analysis supported the identification of key themes in the study of COVID-19 in radiology publications. • Many of the most co-cited articles belong to a heterogeneous group of publications, with authors from countries that are far apart and even from different disciplines.

Effects of Photobiomodulation on Oral Mucositis: Visualization and Analysis of Knowledge

This review article mapped and analyzed the most cited articles on the association of photobiomodulation (PBM) with oral mucositis (OM) and the evolution of clinical protocols in the area. A comprehensive search was performed on the Web of Science Core Collection (WoS-CC) database, leading to the extraction of information such as title, authors, abstract, journal name, number, average of citations, study design, year of publication, institutions, continents, countries, type of laser used, irradiated anatomical points, primary anti-cancer therapy, and laser parameters. Among those, clinical trials and literature reviews were the most common study designs. The main type of laser used was the InGaAlP diode, with a wavelength ranging from 630-660 nm, power going in 40-100 mW, and energy density ranging from 0.375-22 J/cm². As for the anatomical sites irradiated by PBM, the cheek mucosa, upper and lower lips, lateral tongue, and bottom of the mouth stood out. This analysis highlights an increasing interest in PBM as a supportive treatment in cases of OM, as well as the evolution of the technique, types of laser devices, and protocols used.

Research trends and hotspots in the relationship between outdoor activities and myopia: A bibliometric analysis based on the web of science database from 2006 to 2021

Objectives

This study aimed to explore the current status, hotspots, and emerging research trends regarding the relationship between outdoor activities and myopia.

Methods

Publications on the relationship between outdoor activities and myopia from 2006 to 2021 were collected from the Web of Science Core Collection database. CiteSpace (version 6.1.R2) was used to performed a bibliometric analysis, and R software (version 4.1.0) was used to visualize the trends and hot map of publications.

Results

A total of 640 publications were collected and analyzed in the present study. China was the major contributor (n = 204), followed by the United States of America (n = 181) and Australia (n = 137). The United States of America had the most extensive foreign cooperation (centrality = 0.25), followed by Australia (centrality = 0.20). The National University of Singapore contributed the largest number of publications (n = 48), followed by Sun Yat-Sen University (n = 41) and the Australian National University (n = 41). Among institutions, Cardiff University in the United Kingdom had the most extensive foreign cooperation (centrality = 0.12), followed by the National University of Singapore (centrality = 0.11). Saw S from Singapore had the largest number of publications (n = 39), followed by Morgan I from Australia (n = 27) and Jonas J from Germany (n = 23). Investigative ophthalmology & visual science is the most important journal to study the relationship between outdoor activities and myopia. "Global Prevalence of Myopia and High Myopia and Temporal Trends from 2000 through 2050" published by Holden BA was the most cited paper in this field with 177 citations. Co-occurrence and burst analyses of keywords showed that research trends and hotspots in this field focused mainly on "risk," "prevention" and "school".

Conclusions

The influence of outdoor activities on myopia remains a concern. In the future, deeper cooperation between countries or institutions is required to explore the effects of outdoor activities on myopia. Outdoor activities for the prevention of myopia and reduction of the risk of myopia among school students may be the focus of future research.

Exploring the research landscape in a developing country: gauging the prospects of growth, research impact and innovation

Purpose

This study aims to provide guidelines for exploring the research landscape in developing countries by gauging the prospects of growth, research impact and innovation. This study interrogates, analyses and visualizes the impact, nuances and evolution of stated research themes. For this purpose, this study presents an in-depth analysis of publications and citations indexed in Pakistani journals as a case study.

Design/methodology/approach

A bibliometric analysis of 46,034 publications published in Pakistan-based journals uncovers the research landscape of Scopus-indexed scientific literature – using various statistical and network-based approaches. Using VOSviewer and SPSS tools, the publication data has been analysed in relation to the open access status of papers, the number of authors, discipline, research theme and international co-authorship.

Findings

This study’s analyses reveal that while Pakistani journals are attracting international contributions from several countries, including India, Malaysia and Indonesia, no journal falls into the Scopus-defined top Quartile, i.e. the Q1 category. The analyses also highlight that only half (47%) of the publications received citations, whereas the other half remained uncited. Furthermore, open access publications received significantly higher citations than subscribed/traditional publications (print/online subject to toll access).

Originality/value

To the best of the authors’ knowledge, this is the first impact study of its kind that critically analyses the research landscape of Pakistani journals, especially in the context of the efforts of the higher education commission of Pakistan to promote research culture in the country. This study also provides analytical insights and policy guidelines for improving the quality of research published in Pakistani journals. This study can be replicated for other developing nations to provide guidelines and sustainable pathways for scientific growth in pursuit of uplifting nations by allocating resources for developing science and technology.

Publications in Pediatric Epilepsy: Using Bibliometrics to Determine Readings in the Field

Bibliometrics and citation analysis are popular forms of analyzing medical literature based on article impact as determined by the number of citations an article has received from other publications. Many bibliometric studies published within the past 10 years have assembled lists of highly cited papers, top 100 papers, or citation classics of specialties, subspecialties, and specific morbidities. For pediatric epilepsy, there is only 1 study that bibliometrically examines articles in this subspecialty. Although bibliometrics generally examines trends in the literature, we used bibliometrics as a methodology for determining a core set of pediatric epilepsy articles with the highest impact (ie, citation count) that could be used as an introductory reading list for residents, fellows, and early career epileptologists. Therefore, we searched Web of Science to identify the 100 top-cited pediatric epilepsy articles and develop 10 topic areas into which we sorted each article. These recommended articles could be used as essential readings for pediatric epilepsy.

A Bibliometric Analysis of 100 Most-Cited Articles on Corneal Cross-Linking

Background

Highly cited papers are expected to have high-quality data that significantly contribute to the body of knowledge. The study aimed to evaluate the characters of the 100 most-cited articles on corneal cross-linking (CXL) through a bibliometric analysis.

Materials and Methods

The Web of Science database was searched to identify papers published from 1950 to 2020. A bibliometric analysis of the top 100-cited articles was conducted in the current study. The citation differences between basic research, clinical research, and reviews were compared by Kruskal-Wallis test. The association between citations and publication year was evaluated by Spearman correlation analysis. The VOSviewer software was used to create networks of co-authorship and keywords map.

Results

The median values of the number of citations, citations/year since publication, and citations since 2013 were 101, 9.5, and 11.92, respectively. A total of 61% of articles were clinical research. The citations since 2013 of clinical research were lower than basic research and the reviews (all p < 0.001). The publication year was positively correlated with the number of publications (r = 0.665, p = 0.013), and the total number of citations decreased for basic research (r = -0.447, p = 0.017), and clinical research (r = -0.433, p < 0.001). The J REFRACT SURG publishes the highest number of articles. The corresponding authors were predominantly from the Italy (N = 17), Germany (N = 16), and United States (N = 15). Spoerl Eberhard has the highest number of citations and total link strength with 15 articles. Extensive collaboration existed among the main core nodes containing "cross-linking (N = 45)," "riboflavin (N = 44)," and "ultraviolet A (UVA) (N = 42)."

Conclusion

The present study focused on the comprehensive analysis of the top 100-cited articles on the CXL research, providing insight into research developments over the past decades.

Predictors of Citation Rates in High-Impact Glioblastoma Clinical Trials

Clinical trials are at the top of research study designs and tend to attract high citation numbers. Glioblastoma multiforme (GBM) is a multidisciplinary disease that continues to be the subject of peak research interest. In general, the literature relating to the predictors of citation rates in clinical trials remains limited. This review aims to identify the factors that influence citation numbers in high-impact GBM clinical trials. The 100 most cited GBM trials of any phase published from 1975 to 2019 were selected and reviewed. The primary analysis correlated citation numbers of articles with various trial and publication-related predictors using the Pearson correlation coefficient. The secondary analysis compared the mean citation numbers for different subgroups using the mean difference test. The median (range) citation number for the selected 100 trials was 349 (135-16,384). The primary analysis showed a significant correlation between citation numbers of articles and the study population (P = 0.024), trial phase (I-III) (P = 0.0427), and the impact factor (IF) of the journal (P < 0.0001). The secondary analysis demonstrated significantly higher mean citation numbers in all trials with the following features: study population ≥115 (P = 0.0208), phase III (P = 0.0372), treatment protocol including radiotherapy (P = 0.0189), temozolomide (TMZ) therapy (P = 0.0343), IF of the journal ≥14.9 (P = 0.02), and general medical journals (P = 0.28). We conclude that the most significant predictors of citation rates in high-impact GBM trials were the study population, trial phase, and journal's IF. The treatment protocol was a positive predictor when it included the currently widely accepted treatment modalities (radiotherapy and TZM). Randomization, age of publication, as well as the numbers of arms, authors, centers, countries, and references were not significant predictors. Increasing awareness of the factors that could affect citations may help researchers undertaking clinical trials to enhance the academic impact of their work.

Mapping the scientific research on radiology departments: Global trends in publication, collaboration and trending topics

PURPOSE

To characterize the global research trend in radiology departments based on bibliometric indicators.

MATERIAL AND METHOD

As a source of information, Science Citation Index Expanded and Journal Citation Reports from Web of Science Core Collection (WoSCC) were used. Annual trends, journals of publication, subject categories of journals, collaboration indexes between authors and institutions, network of cowords and most cited papers were identified and analysed. The period of study was 2009-2018.

RESULTS

283,587 downloaded papers were analysed. The number of articles was increasing, as well as the percentage of funded works. Papers were published in 7314 different journals, being the most productive Plos One (5077), followed by American Journal of Roentgenology (4602) and European Radiology (3644). Most productive subject categories of journals were Radiology, Nuclear Medicine & Medical Imaging (86,568 papers), Clinical Neurology (29,722) and Surgery (23,564). International collaboration has increased more than 5 points, from 15.2% in 2009 to 20.7% in 2018.

CONCLUSIONS

Most cited articles were published in high impact journals outside the scope of diagnostic imaging. Most influential topics included technical innovations within imaging modalities. MRI replaced conventional radiography and CT as the imaging technique of choice in imaging research.

Top 50 cited articles on Covid-19 after the first year of the pandemic: A bibliometric analysis

BACKGROUND & AIMS

It has been just over a year since the Covid-19 pandemic started. The top 50 cited articles on this subject would help identify trends and focus on the research efforts.

METHODS

We utilised e-utilities in PubMed to find publications on Covid-19 until the date of search on 7/2/21. The iCite website was used to find the top 50 citations of the output from the search strategy. We looked into their full text for the editorial dates, type of study, level of evidence, focus of the article and country of origin. We also counted the errata and comments on each of them.

RESULTS

The total number of citations of all 50 articles was 123,960, the highest being 10, 754 for a single article. Huang C was the most cited first author. They were published from week 4-17, with February being the month with most citations. Lancet was the most cited journal, having published 9 of the 50 articles. Majority belonged to level 3 of the evidence ladder and were retrospective studies. Thirty percent of them had an errata published and an average of 7 comments per article.

CONCLUSION

The top 50 most cited articles identify the most impactful studies on Covid-19, providing a resource to educators while identifying trends to guide research and publishing efforts. There has been an explosion of publications and an unprecedented rate and number of citations within the first year for any single condition in the literature.

Is the open access citation advantage real? A systematic review of the citation of open access and subscription-based articles

AIMS

Over the last two decades, the existence of an open access citation advantage (OACA)-increased citation of articles made available open access (OA)-has been the topic of much discussion. While there has been substantial research to address this question, findings have been contradictory and inconclusive. We conducted a systematic review to compare studies of citations to OA and non-OA articles.

METHODS

A systematic search of 17 databases attempted to capture all relevant studies authored since 2001. The protocol was registered in Open Science Framework. We included studies with a direct comparison between OA and non-OA items and reported article-level citation as an outcome. Both randomized and non-randomized studies were included. No limitations were placed on study design, language, or publication type.

RESULTS

A total of 5,744 items were retrieved. Ultimately, 134 items were identified for inclusion. 64 studies (47.8%) confirmed the existence of OACA, while 37 (27.6%) found that it did not exist, 32 (23.9%) found OACA only in subsets of their sample, and 1 study (0.8%) was inconclusive. Studies with a focus on multiple disciplines were significantly positively associated with finding that OACA exists in subsets, and are less associated with finding that OACA did not exist. In the critical appraisal of the included studies, 3 were found to have an overall low risk of bias. Of these, one found that an OACA existed, one found that it did not, and one found that an OACA occurred in subsets.

CONCLUSIONS

As seen through the large number of studies identified for this review, OACA is a topic of continuing interest. Quality and heterogeneity of the component studies pose challenges for generalization. The results suggest the need for reporting guidelines for bibliometrics studies.

Publication Trends of Nonobstetric Brachial Plexus Injury Research: A Bibliometric Analysis

OBJECTIVE

To evaluate publication trends in nonobstetric brachial plexus injury research.

METHODS

In September 2020, Scopus was searched for articles on nonobstretric brachial plexus injury. Citation count, year of publication, country of corresponding author and its income category, destiny journal and its 5-year impact factor (IF), and research type were retrieved.

RESULTS

The analysis comprised 1245 articles. Mean number of citations per article was 18.01 (95% confidence interval 16.46-19.55). Mean IF was 3.60 (95% confidence interval 3.25-3.95). The 5 most prolific journals had an IF <5. The journal with the highest number of articles was the Journal of Hand Surgery (American Volume) (n = 70, 5.6%). The most prolific country was the United States (n = 313, 25.1%). There were 913 articles (73.3%) from high-income countries, 246 (19.8%) from upper middle-income countries, and 68 (5.5%) from lower middle-income countries. No articles were from low-income countries. The representation of middle-income countries increased from 2.1% of published articles in 1980-1989 to 40.0% in 2010-2019. Primary research represented 64.0% (n = 797) of articles, while secondary research and case reports represented 13.0% (n = 162) and 23.0% (n = 286) of articles, respectively. Narrative reviews (n = 142, 11.4%;) and systematic reviews (n = 20, 1.6%) comprised articles from the secondary research group.

CONCLUSIONS

While high-income countries still represent the majority of publications, the contribution of researchers from middle-income countries is increasing. The most common destiny journals are field specific, with a relatively low IF. Although most articles are primary research, a representative portion have a shallow level of evidence (case reports and narrative reviews).

The top 100 most-cited papers authored by Dr. Jens Ove Andreasen: A bibliometric analysis

BACKGROUND/AIM

Dr. Jens Ove Andreasen, the "father" of dental traumatology, passed away on September 26, 2020. As a tribute, the aim of this study was to catalog and analyze the top 100 most-cited papers (co)authored by Dr. Andreasen.

MATERIALS AND METHODS

A bibliometric analysis was conducted on October 21, 2020, in the Web of Science Core Collection (WoS-CC) database. The numbers of citations in the WoS "All Databases" section, Scopus, and Google Scholar databases were cross-matched. Two researchers collected the following bibliometric data: title, number of citations, authors, country, year, journals, study design, and theme. The VOSviewer software was used to generate collaborative network maps for the authors and keywords.

RESULTS

Of 194 papers identified in WoS-CC, a list was compiled with the 100 most-cited papers (co)authored by Dr. Andreasen. The number of citations of each paper ranged from 24 to 365 (mean: 85.4). Nine papers were cited more than 200 times. Most papers were published in Dental Traumatology (55%), between the 1990's and 2000's (60%), with a laboratory design (40%). One hundred and nine (co)authors, from 19 countries were identified in the top 100 most-cited papers. Dental traumatology was the most studied theme (52%).

CONCLUSIONS

The top 100 most-cited papers (co)authored by Dr. Jens Ove Andreasen were composed mainly of laboratory and observational studies, published mostly in Dental Traumatology. The present study was a humble homage to highlight the importance of his research and work. However, his legacy goes beyond the numbers and will always remain unsurpassed.

Profile of Articles Published in AJR From 2014 to 2018 and Potential Association With Bibliometric Parameters

OBJECTIVE. The purpose of this study was to assess the profile of articles published in the American Journal of Roentgenology (AJR) and potential associations with bibliometric indexes over a 5-year period. MATERIALS AND METHODS. Citable documents published from 2014 to 2018 were retrieved from the Journal Citation Reports database. Six bibliometric indexes were assessed. The following article parameters were retrieved: type, subspecialty (17 topics covered by AJR), origin, and title. Differences between groups were assessed by t test, ANOVA, Kruskal-Wallis test, or chi-square test. Citability was assessed by regression analysis. RESULTS. After exclusions, 2210 articles were considered citable and included in the analyses. Most of the metrics improved slightly, except for the Eigenfactor score and article influence score, which decreased. Original articles were preponderant; AJR published significantly more review articles than did three other general radiology journals. The mean number of citations per year of original articles (2.03 ± 2.18) was significantly larger than that of review articles (2.06 ± 2.47) (p = .02). The mean number of citations per year was significantly higher for articles with mixed-origin authorship (3.12 ± 3.19) than for articles with American (2.02 ± 2.17) or non-American (1.93 ± 2.26) authors only (p < .001). The distributions of mean number of citations per year among subspecialties differed significantly (p = .001). Articles on abdominal, musculoskeletal, pediatric, and women's imaging were more frequently cited. Multivariate regression analysis showed that subspecialty and presence of acronyms or initialisms in the title were the only independent predictors of citability (both, p = .001). CONCLUSION. The main AJR bibliometric indexes increased slightly from 2014 to 2018, except for those from the Eigenfactor Project. The presence of acronyms or initialisms in the title and subspecialty were the only independent predictors of citability.

Evaluating the Highest- and Lowest-cited Research Articles in the Cardiothoracic Surgery Literature

BACKGROUND

Understanding the differences between articles that amass a high number of citations and those that receive very few allows investigators to write journal articles that maximize the impact of their research. There are minimal data regarding these two cohorts in the cardiothoracic surgery literature.

METHODS

We identified all primary research articles from 1998 to 2008 from The Journal of Thoracic and Cardiovascular Surgery, The Journal of Cardiac Surgery, The Annals of Thoracic Surgery, and The European Journal of Cardio-Thoracic Surgery (n = 4276). Eighty-seven of these articles accrued 0 or only 1 citation within 10 y of publication. We compared this "low citation" cohort to the "high citation" cohort made up of the 87 highest-cited articles from the same journals over the same time period.

RESULTS

When compared with the low-citation articles, high-citation articles were significantly more likely to be clinical in nature (P < 0.0001), have observational study design (P < 0.0001), involve multidisciplinary authorship (P < 0.0001), and have more funding reported (P = 0.0039). With regard to technical aspects of the article, the high-citation articles were likely to have longer titles (P = 0.0086), punctuation in the title (P = 0.0027), longer abstracts (P = 0.0007), more words in the manuscript (P < 0.0001), more authors (P < 0.0001), more declared conflict of interests (P = 0.0167), more references (P < 0.0001), more tables (P < 0.0001), more figures (P = 0.0024), and more pages (P < 0.0001). There was no significant difference in the year of publication among both cohorts.

CONCLUSIONS

This review suggests that there are several important distinguishing characteristics that should be considered by investigators when designing and implementing cardiothoracic research studies to maximize the impact of their published research.

The Top 100 Most-Cited Papers in Cariology: A Bibliometric Analysis

A highly cited paper is seen as a landmark in any field and can influence both research and clinical practice. This study aimed to quali-quantitatively analyze the 100 most-cited papers in Cariology. A search strategy was first determined using specific keywords related to the field. A comprehensive search was then conducted in the Thompson Reuters Web of Science citation indexing database up to April 2019. Papers focused on any aspect of Cariology were included. A panel of 4 researchers conducted the selection of papers and extracted data on the number of citations, title, authors, country, year, journals, study design, and topic of interest. Scopus and Google Scholar were also searched to compare the number of citations. The VOSviewer software was used to generate bibliometric networks. The number of citations among the top 100 most-cited papers ranged from 168 to 1,961 with a mean of 292,66. Three papers had more than 1,000 citations. The Journal of Dental Research (20%) and Caries Research (17%) had more top papers. The oldest and the most recent papers were published in 1960 and 2015. Literature reviews (35%) and laboratorial studies (31%) were the most common study designs. The countries with the highest number of most-cited papers were the USA (40%), Sweden (10%), and Japan (9%). The most studied fields of interest were etiology/pathogenesis (41%) and prevention (20%). VOSviewer maps revealed collaborative networks between countries and organizations. The top 100 most-cited papers in Cariology were published mainly by European and Anglo-Saxon American authors and were composed mainly of literature reviews with etiology/pathogenesis as the most frequent topic of interest.

The 100 top-cited meta-analyses of diagnostic accuracy in radiology journals: a bibliometric analysis

Purpose

To identify the 100 top-cited meta-analyses of diagnostic accuracy studies published in radiology, medical imaging and nuclear medicine journals.

Methods

A PubMed search with pre-defined criteria was performed. The 100 top-cited articles meta-analyses were retrieved, using a custom Python script and the Scopus Application Programming Interface (Elsevier). Publication, citation and affiliation details were extracted from each meta-analysis. No formal statistical analysis was performed.

Results

The top meta-analysis was cited 394 times, the 100th meta-analysis 38 times. The USA was the top country represented in the papers (33 meta-analyses) followed by The Netherlands, China and Germany. The journal Radiology published 24 studies. The most common modality reported was positron emission tomography (PET) or PET computed tomography (36 instances), followed by magnetic resonance imaging (30 instances) and computed tomography (27 instances). Cardiac (19 meta-analyses), abdominal (18 meta-analyses), followed by neurological (12 meta-analyses) investigations were the most frequently encountered in the top 100 cited meta-analyses.

Conclusions

The 100 top-cited meta-analyses encompass a broad range of imaging modalities and body regions. This may comprise a useful resource for identifying influential evidence-based diagnostic accuracy information in radiology.

Top 100 most-cited papers in core dental public health journals: bibliometric analysis

OBJECTIVE

This quali-quantitative study analysed the 100 most-cited papers in core dental public health (DPH) journals focusing on understanding international knowledge production.

METHODS

The DPH journals were selected from titles and scopes at Web of Science Core Collection database up to March 2020. Further comparisons were performed at Scopus and Google Scholar databases. Some bibliometric parameters were extracted as follows: title, number of citations, citation density (number of citations per year), first author's country, year of publication, study design and subject. VOSviewer software was used to create graphical bibliometric maps.

RESULTS

Papers were ranked by the total number of citations, which ranged from 104 to 1,019, and six papers were cited more than 400 times. Papers were published from 1974 to 2013, mainly in Community Dentistry and Oral Epidemiology. Most frequent study designs were cross-sectional (30%) and nonsystematic review (25%). Most papers were from Europe (54%) and North America (31%). First authors were predominantly from the United Kingdom (17%), United States of America (17%) and Canada (14%). VOSviewer map of co-authorship demonstrated the existence of clusters in the research collaboration. Although epidemiology was the most frequent subject (84%), health services research presented eight times higher citation density.

CONCLUSIONS

Top 100 most-cited papers in core DPH journals were predominantly observational studies from Anglo-Saxon countries. Top 100 most-cited papers in core DPH journals tend to be cross-sectional studies carried out in the United States with highest citation in health services research. Locker D, Petersen PE and Sheiham A are a landmark for DPH field.

[Investigation of Research Trends in Radiological Technology Using Text Mining]

The purpose of this study was to investigate the trends of researches regarding radiological technology. We collected research papers published from 2007 to 2017 from Japanese Society of Radiological Technology (JSRT). After preprocessing, we performed morphological analysis using terminology from Japan Radiological Society, Japan Society of Medical Physics, and JSRT to extract technical terms. Furthermore, we calculated the Jaccard similarity coefficient to represent the similarity between two terms. This value ranged from 0 to 1, where 0 implied that the terms were completely dissimilar. Finally, in order to detect terms that characteristically appear in each year, we visualized co-occurring terms by using network diagrams. From the morphological analysis, 5471 technical terms were extracted. The most frequency term was "image" from 2007 to 2017. "Phantom" and "CT" were frequent terms after "image." In addition, the number of research papers including "image," "phantom," and "CT" were increasing. For network analysis, the characteristic terms in 2007 were "filter" and "HU"; those in 2012 were "dimension," "standard deviation,"and "artifact"; and those in 2017 were "PET," "scattered ray," and "collimator." In conclusion, the highest interest research topic in radiological technology was "image," and recently, there has been a tendency to be interested in topics related to nuclear medicine.

A Bibliometric Analysis of Citation Classics in the Journal of Ultrasound in Medicine

OBJECTIVES

A bibliometric analysis of articles in the Journal of Ultrasound in Medicine (JUM) identified the journals' most impactful articles.

METHODS

A bibliometric analysis of citation classics that were published in the JUM from its inception in 1982 to 2019 was performed. All citation classics, defined as articles cited 100 or more times, were evaluated for the number of citations, citations per year, publication year, subspecialty, design, and country of origin. Characteristics were compared before and after 1998 by the Mann-Whitney test for unpaired data and 2-sample z tests of sample proportions. The Kruskal-Wallis test for nonparametric continuous data was used to compare the median number of citations per year by decade of publication.

RESULTS

A total of 7868 articles were published in the JUM between 1982 and 2019; 54 (0.7%) were citation classics. The median citation classics year of publication was 1998 (interquartile range [IQR], 1991-2003). Most citation classics originated from the United States (36 of 54 [66.7%]), were observational (47 of 54 [87%]), and were related to obstetric and gynecologic topics (16 of 54 [29.6%]). Citation classics after 1998 received significantly more citations per year (9.3 versus 4.7; P < .001), with no other differences noted. The median number of citations per year increased for each decade, with medians of 4 citations (IQR, 3.6-4.7) in 1982 to 1991 and 11.2 citations (IQR, 9-13.9) in 2002 to 2012 (P < .001).

CONCLUSIONS

This list provides insight into the most influential articles that were published in the JUM. Most citation classics were observational, were from the United States, and covered obstetric and gynecologic topics. Citation classics received more citations per year after 1998.

Bibliometric analysis of manuscript characteristics that influence citations: A comparison of ten major dermatology journals

BACKGROUND

The number of citations an article receives is a reassuring marker for its influence in the academic world.

OBJECTIVE

We aimed to discover characteristics of dermatology articles that may impact their citation.

METHODS

This cross-sectional study collected and analyzed articles published between January and June 2013 from ten highest impact dermatology journals. The study included manuscript characteristics i.e. the length of an article, the presence of visual aids, accessibility, originality, and clarity. Citation analysis statistics required multiple tools such as linear regression, point-biserial correlation, Spearman's rank-order correlation, and Kruskal-Wallis to determine the association between these study variables and the number of citations of articles.

RESULTS

Of 748 articles included in our study, the number of citations ranged from 0 to 814 (median: 18), with weak positive correlations to the length of manuscript (word count: r_s 0.3, p<0.001; pages: r_s 0.3, p<0.001). Having a structured abstract (r_pb -0.15, p<0.001) and increasing number of references (r_s -0.26, p<0.001) showed a negative correlation. Studies originating in North America were associated with higher citations, followed by Europe and Asia (p<0.001). Review articles had a higher number of citations (p<0.001).

CONCLUSIONS

We found that the number of words and the number of pages within a dermatology manuscript had the strongest positive correlation for a higher citation count. The results of this study can benefit authors who may improve the citation of their articles by utilizing this bibliometric study when assembling their manuscript.

Factors Associated With the Highest and Lowest Cited Research Articles in General Surgery Journals

BACKGROUND

Citation count is a common bibliometric tool used to determine the long-term impact and performance of journal articles. Many of the other potential factors associated with highly and lowly cited articles in the general surgery literature, however, remain unknown. The purpose of this study was to attempt to identify characteristics of articles that may predict or correlate with article citation counts and, consequently, article impact.

METHODS

We identified articles from Annals of Surgery, British Journal of Surgery, and Journal of the American College of Surgeons between 1998 and 2008 that had 0-5 total citations. We then matched these articles to an identical number of the highest cited articles from these same journals for comparison. Student's t-tests, Wilcoxon rank-sum tests, chi-squared tests, and Fisher's exact tests were used to determine the significance of difference between data sets at a predetermined level of significance set to P < 0.05.

RESULTS

Significant differences of article characteristics between the two cohorts included higher prevalence of clinical studies (P = 0.3919), multi-institutional (P = 0.0007) and multi-national (P = 0.0023) studies, surgical oncology (P < 0.0001) or hepatobiliary focus (P < 0.0001) and published in Annals of Surgery (P < 0.0001) for the highly cited cohort. Highly cited articles were also more likely to have larger sample sizes (P = 0.0009), more authors (P < 0.0001), presence of statistically significant results (P < 0.0001), more references (P < 0.0001), more tables (P < 0.0001), more figures (P = 0.0001), and higher word counts for manuscript (P < 0.0001), abstract (P < 0.0001), and title (P < 0.0001).

CONCLUSIONS

There are a relatively small number of articles with 0-5 citations after 10 y for these major general surgery journals. This indicates that journals are consistently able to select articles that will be impactful in aiding future research. Certain factors, however, are associated with being highly cited as opposed to lowly cited, and an understanding of these factors can aid researchers and journals in designing and reporting future studies.

Predictors of Citation Rate for Original Research Studies in the Canadian Association of Radiologists Journal

OBJECTIVE

This study is aimed to identify predictors of citation rate of original research published in the Canadian Association of Radiologists Journal (CARJ).

METHODS

A search of MEDLINE was conducted from January 1, 2000-June 30, 2013 to identify all studies published in the CARJ. Original research studies were included. Reviews, pictorial essays, guidelines, case studies, case series, and original studies with a sample size <10 were excluded. Variables assessed for association with citation rate included number of authors, study design, sample size, multi-institutional study, multi-national study, study type, presence of statistically significant result, presence of funding, and number of references. Statistical analysis was completed using linear regression and Pearson correlation coefficients (r).

RESULTS

A total of 714 studies were published in CARJ, of which 181 were original research publications that were cited a total of 1517 times. Twelve original research studies were uncited, while the most-cited one was cited 58 times. Sample size (r = 0.177, P = .017) and number of references (r = 0.164, P = .028) demonstrated statistically significant weak positive correlations with citation rate. Number of authors, study design, setting, statistically significant results, and funding were not associated with citation rate.

CONCLUSION

Only a very small number of original research studies published at the CARJ remained uncited 5 or more years after the publication. Sample size and number of references were identified as significant, but weak predictors of citation rate in CARJ.

Uncited Research Articles in Popular United States General Radiology Journals

RATIONALE AND OBJECTIVES

This study aimed to characterize articles in popular general radiology journals that go uncited for a decade after publication.

METHODS

Using the Web of Science database, we identified annual citation counts for 13,459 articles published in Radiology, American Journal of Roentgenology, and Academic Radiology between 1997 and 2006. From this article cohort, we then identified all original research articles that accrued zero citations within a decade of publication. A concurrent equal-sized cohort of most cited articles was created. Numerous characteristics of the uncited and most cited articles were identified and compared.

RESULTS

Only 47 uncited articles went uncited for a decade after publication. When compared to the 47 most cited articles over that same window, the uncited articles were significantly (P < .05) less likely to have a clinical focus, include a nonradiologist author and authors from multiple institutions and multiple nations, report research funding support and statistically significant findings, and include punctuation marks in their titles. Compared to the most cited articles, uncited articles also had significantly (P < .05) fewer authors, abstract words, manuscript words, references, tables, figure parts, and pages, as well as smaller subject sample sizes.

CONCLUSION

Of articles published in popular general radiology journals, only a very small number of original research investigations remained uncited a decade after publication. Given that citations reflect the impact of radiology research, this observation suggests that journals are appropriately selecting meaningful work. Investigators seeking to avoid futile publication might consider their research initiatives in light of these characteristics.

Bibliometric analysis of manuscript characteristics that influence citations: A comparison of six major psychiatry journals

In this study we investigated the characteristics of psychiatry manuscript that influence its citation rate. We conducted a cross-sectional study of published articles (n = 545), from January to June 2007, from 6 major psychiatry journals with the highest 5-year impact-factor. Citation count for these articles was retrieved from Web Of Science (by Clarivate Analytics) and 22 article characteristics were tabulated manually. We then predicted the citation rate by performing univariate analysis, spearman rank-order correlation, and multiple regression model on the collected variables. Using spearman rank-order correlation, we found the following variables to have significant positive correlation with citations: abstract character count (r_s and p-value, 0.22 and 0.001 respectively), number of references (0.2, 0.01), abstract word count (0.17, 0.0005), number of pages (0.15, 0.003), open access (0.06, 0.05), study design reported in title (0.04, 0.0001), total number of words (0.03, 0.01) and structured abstract (0.03, 0.0009). In a multivariate linear regression model, the following variables predicted increased citation rates (p < 0.001, R² = 0.38): reporting of study design in title, structured abstract and open access. Editors and authors of psychiatry journals can improve the impact of their journals and articles by utilizing this bibliometric study when assembling their manuscript.

Factors Associated With the Highest and Lowest Cited Research Articles in Urology Journals

OBJECTIVE

To determine what factors of published urology research articles are associated with future citations.

METHODS

We identified all primary research articles published between 1997 and 2007 in Journal of Urology, British Journal of Urology International, Urology, and European Urology. Only 50 articles in this period had accrued 0 or 1 citation in a 10-year period following publication. We compared the characteristics of the articles in the low citation cohort to the 50 articles with the highest number of citations from the same journals and time period. Student's t tests, Wilcoxon rank-sum tests, chi-squared tests, and Fisher's exact tests were used to analyze the data with predetermined level of significance set to P < .05.

RESULTS

There were many significant differences between the 2 cohorts. When compared to the cohort of articles with 0 or 1 citation, highly cited articles were significantly more likely to be a clinical study, multi-institutional and multinational effort, and related to the field of urologic oncology. They were also significantly more likely to have a larger sample size, a statistically significant primary finding, more authors, more references, and more tables, as well as longer title, abstract, and overall manuscript word counts.

CONCLUSION

Very few articles published in the major urology journals accrued 0 or 1 citation over a 10-year period. This suggests that the vast majority of articles selected for publication are used for further future research. Nevertheless, there were distinct differences between the 2 cohorts, showing that certain factors are associated with articles being cited more frequently.

Who's Contributing Most to American Neuroscience Journals: American or Foreign Authors?

BACKGROUND AND PURPOSE

With globalization, the contributions of authors from abroad to the American published literature has increased. We sought to determine the changes with time in the proportional contributions of American and non-American authors in the American neurosciences literature. We hypothesized the following: 1) During the past 21 years, manuscript contributions of American institutions have proportionally decreased in neuroradiology, more than in neurosurgery or neurology; 2) contributions of Asian institutions have affected neuroradiology more than neurosurgery and neurology; and 3) American articles garner more citations.

MATERIALS AND METHODS

We reviewed the May issues of 2 of the highest impact American-based neurology, neurosurgery, and neuroradiology journals published from 1997 to 2017. We counted the number of articles published by nation based on the institution of origin. We looked at trends across time and compared neurology, neurosurgery, and neuroradiology journals. We also gathered data on the number of citations of each article by nationality.

RESULTS

We reviewed 3025 articles. There was a significantly lower ratio of American to non-American authorship in neuroradiology versus neurology/neurosurgery journals (odds ratio = 0.70; 95% confidence interval, 0.60-0.82). There was a significantly decreasing trend in American authorship across the 21 years in neuroradiology. Of the countries outside the United States, Japan contributed most for neuroradiology and neurosurgery journals, and the UK, for neurology. American-authored articles were cited, on average, 1.25 times more frequently than non-American-authored articles.

CONCLUSIONS

Non-American contributions have impacted neuroradiology more than other clinical neuroscience fields with Asian authorship showing the greatest impact. That impact is growing, and the causes are manifold. Nonetheless American-authored articles are cited more.