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. 2020 Jul 1;126:184–191. doi: 10.1016/j.jclinepi.2020.06.032

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© 2020 Elsevier Inc. All rights reserved.

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 — Proliferation of publications on COVID-19 found in PubMed on 5th June 2020 with creation dates in 2020 [corresponding to week 23] (all fields search for (“COVID-19″ OR “nCoV” OR ″2019 novel coronavirus” OR ″2019-nCoV” OR “SARS-CoV-2″) AND research). A total of 19,260 hits were identified. Data and code were freely accessible from https://github.com/nealhaddaway/COVID19/. Week of 2020 calculated based on PubMed creation date. Records lacking creation date were excluded.