Papers identified during the main database search strategy were exported into Endnote [18] and subsequently in Rayyan (https://www.rayyan.ai/) [19]. The screening of the papers was performed in Rayyan by two independent reviewers (A.M.P., W.L.), by screening title/abstract and the full text of the articles in one stage. The screening of the grey literature was performed by the two reviewers directly from the specific websites included in the search (see Additional file 1: Data 2).
Agreement between the two reviewers was assessed by the kappa coefficient. Discrepancies in the study selection were discussed after the screening; and if agreement could not be reached, a third reviewer was involved (L.F.K.).
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