Methods
We performed a systematic search of the PubMed, EMBASE and Web of
science databases to identify relevant articles from the inception of
the database to October 2nd, 2020. The search strategy
used in each database is elaborated in Supplementary File 1. Extracted
citations were imported into Mendeley reference manager and screened for
relevance. Screening was performed at two levels. At the first level,
articles and abstracts were screened for relevance. At the second level,
articles identified by title and abstract screening were subjected to
full text review. A second manual search was performed to identify
articles published after the initial search until publication. The
PRISMA flow chart for inclusion of studies is described in Figure 1.