PRISMA2009FlowDiagramFrom:MoherD,LiberatiA,TetzlaffJ,AltmanDG,ThePRISMAGroup(2009).PreferredReportingItemsforSystematicReviewsandMeta-Analyses:ThePRISMAStatement.PLoSMed6(6):e1000097.doi:10.1371/journal.pmed1000097Formoreinformation,visitwww.prisma-statement.org.Recordsidentifiedthroughdatabasesearching(n=)ScreeningIncludedEligibilityIdentificationAdditionalrecordsidentifiedthroughothersources(n=)Recordsafterduplicatesremoved(n=)Recordsscreened(n=)Recordsexcluded(n=)Full-textarticlesassessedforeligibility(n=)Full-textarticlesexcluded,withreasons(n=)Studiesincludedinqualitativesynthesis(n=)Studiesincludedinquantitativesynthesis(meta-analysis)(n=)
