![]() ![]() Therefore, some filtering system may be essential to efficiently narrow down desired publications from the vast collection and ensure that relevant and valuable studies are selected. 9 The COVID-19 pandemic has seemingly been associated with an exacerbated issue of waste of studies (ie, doing unnecessary or poorly designed studies), 10 making the proper assessment and synthesis of research trends in COVID-19 research challenging. A citation analysis of studies published in predatory journals found that 60% of publications had not attracted any citations and 38% were cited only up to 10 times. However, as previously found in 2020, 8 the increase in COVID-19–related publications has not necessarily been associated with increased high-quality evidence, and this concern has become a reality in 2023. 6 In addition, comparing trends across countries and institutional affiliations may support scientific policy and research management. In such an expanding research environment, investigating research trends may help identify knowledge gaps and provide insightful research directions. 5 The dissemination of COVID-19 research is highly active and constantly evolving. 4 As a result, the total number of COVID-19–related publications, including preprints, has increased dramatically and now exceeds 350 000 studies. ![]() 1 This trend may have been amplified by the use of preprint systems, such as medRxiv 2 and bioRxiv, 3 during the pandemic, as well as by the proliferation of predatory journals. Since the outbreak of COVID-19 in December 2019, numerous studies have been conducted and published worldwide in response to the pandemic. Similarly, the top 5 institutional affiliations in May to June 2020 by highly cited studies per 2-month period were from China (Huazhong University: 14.7 studies University of Hong Kong: 6.8 studies Wuhan University: 4.8 studies Zhejiang University: 4.5 studies Fudan University: 4.5 studies), while in November to December 2022, the top 5 institutions were in the US and UK (Harvard University: 15.0 studies University College London: 11.0 studies University of Oxford: 10.2 studies University of London: 9.9 studies Imperial College London: 5.8 studies).Ĭonclusions and Relevance This study found that the total number of highly cited studies related to COVID-19 peaked at the end of 2021 and showed a downward trend until the end of 2022, while the origin of these studies shifted from China to the US and UK. Subsequently, the number of highly cited studies per 2-month period published by China declined (decreasing from 179.7 studies in November to December 2020 to 40.7 studies in September to October 2022), and the UK produced the second largest number of such studies in May to June 2021 (171.3 studies). ![]() China had the highest number of highly cited studies per 2-month period until July to August 2020 (138.3 studies vs 103.7 studies for the US, the second highest country), and the US had the greatest number of highly cited studies afterward (159.9 studies vs 157.6 studies for China in September to October 2020). Results The number of published COVID-19–related highly cited studies was 14 studies in January to February 2020, peaked at 1292 studies in November to December 2021, and showed a downward trend thereafter, reaching 649 studies in November to December 2022. Main Outcomes and Measures The number of publications by research field, country, and institutional affiliation. Data were analyzed from January through July 2023. The number of highly cited studies was counted based on the fractional counting method. Bibliographic details were extracted from WOS and combined with ESI data using unique accession numbers. Highly cited studies were extracted from the ESI database bimonthly between January 2020 and December 2022. Objective To examine research trends of highly cited studies by conducting a bibliometric analysis of highly cited studies in the previous 2 months about COVID-19.ĭesign, Setting, and Participants In this cross-sectional study, Essential Science Indicators (ESI) and Web of Science (WOS) Core Collection were used to find studies with a focus on COVID-19 that were identified as highly cited studies from Clarivate Analytics. Research trends of highly cited papers may enable identification of influential research, providing insights for new research ideas it is therefore important to investigate trends and focus on more influential publications in COVID-19–related studies. Importance Since the onset of the COVID-19 outbreak, an extremely high number of studies have been published worldwide, with variable quality. Shared Decision Making and Communication.Scientific Discovery and the Future of Medicine.Health Care Economics, Insurance, Payment.Clinical Implications of Basic Neuroscience.Challenges in Clinical Electrocardiography.
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