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. 2020 Apr 28;6(1):e000716. doi: 10.1136/bmjsem-2019-000716

Figure 1.

Figure 1

PRISMA flow diagram depicting 2851 studies screened following the removal of search duplicates. Eighty-six studies underwent full-text screening, of which 10 eligible studies were included in both qualitative and quantitative syntheses. Adapted from Moher et al.32 PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.