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3.1. Screened databases and keywords

CP Carla Pires
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On 12 April 2020, four databases were screened: PubMed, (Scientific Electronic Library Online) SciELO, Google Scholar and Directory of Open Access Journals (DOAJ), 16 , 17 , 18 , 19 with the following keywords: (“mask and SARS” and “mask and Cov”). These keywords were conveniently selected to cover a likely high number of papers.

PubMed is managed by the National Center for Biotechnology Information (NCBI), at the US National Library of Medicine (NLM), covering 30 million citations from diverse sources, such as MEDLINE, life science journals or online books. 16 SciELO is an electronic library comprising Brazilian scientific journals (around 400 listed). 17 Google Scholar aims to organise the global academic information, such articles, theses or books, comprising around 389 million records. 18 DOAJ is a directory offering open access to peer‐reviewed journals (14,447 journals and 4 788 192 articles). 19

Copyright and License information:  ©2021 John Wiley & Sons Ltd
This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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