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. 2022 Jul 30;49:102405. doi: 10.1016/j.tmaid.2022.102405

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 1 — A. The number of published articles each year on coronavirus in the WoSCC database from 1992 to June 2022. B. The curve of published articles each month on COVID-19 and SARS-CoV-2 from January 2020 to June 2022. C. Geographical distribution of global output. D. The collaboration network of the top-30 most productive institutions. The size of the node presents the number of articles published by an institution, and the width of the edge between the two nodes indicates the degree of cooperation between the two institutions. The institutes belonging to the same country or region are presented by the same color. E. Network of top-30 keyword occurrence. The size of the node presents the frequency of keyword occurrences, and the width of the edge presents the frequency of co-occurrence of two keywords. The color of the node presents different type of clustering: SARS-CoV-2 and physical diseases (green), mental health (red), epidemiology (blue), and pandemic (yellow). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)