*2.3. Study Selection*

Identified papers from each of the databases were imported into Endnote reference management software X9 (Clarivate Analytics). Two authors independently removed the duplicates, examined the titles and reviewed the abstracts for relevance, and then sorted the remaining records for "inclusion", "exclusion", or "potentially relevant". The full-text articles of eligible records rated "potentially relevant" were obtained, reviewed, and rated independently by the two reviewers. Any discrepancies were resolved by discussion between the authors.
