Two investigators (V.P. and A.V.H.) developed the search strategy, which was revised and approved by the other investigators. We searched the following databases until 2nd of December 2020: PubMed-MEDLINE, EMBASE-OVID, Scopus, Web of Science, the Cochrane Library, medRxiv.org (www.medrxiv.org, accessed on 2 December 2020) and Preprints (www.preprints.org, accessed on 2 December 2020). The PubMed search strategy is shown in the Supplementary Materials.
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