Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement

National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't terminology as topic* guideline david moher alessandro liberati evidence-based practice / standards meta-analysis as topic* periodicals as topic / standards publication bias publishing / standards* quality control review literature as topic* initials='g' affs=[] is_editor=false suffix=none equal_contrib=false) initials='jp' initials='j' initials='a' initials='ja' initials='b' initials='n' initials='p' initials='l' initials='k' author(firstnames='peter c' initials='pc' initials='d' affs=[]) initials='m' author(firstnames='jérémy' initials='c' author(firstnames='david' initials='r' author(firstnames='roberto' initials='e' initials='v' lastname='clarke' initials='t' author(firstnames='b' author(firstnames='peter' initials='jj' author(firstnames='virginia' equal_contrib=false)] author(firstnames='mike' pmid:19622511 doi:10.7326/0003-4819-151-4-200908180-00135 collabauthor(name='prisma group' investigators=[author(firstnames='doug' lastname='altman' author(firstnames='gerd' lastname='antes' lastname='atkins' lastname='barbour' author(firstnames='nick' lastname='barrowman' author(firstnames='jesse a' lastname='berlin' author(firstnames='jocalyn' lastname='clark' author(firstnames='deborah' lastname='cook' lastname="d'amico" author(firstnames='jonathan j' lastname='deeks' author(firstnames='p j' lastname='devereaux' initials='pj' author(firstnames='kay' lastname='dickersin' author(firstnames='matthias' lastname='egger' author(firstnames='edzard' lastname='ernst' lastname='gotzsche' lastname='grimshaw' author(firstnames='gordon' lastname='guyatt' author(firstnames='julian' lastname='higgins' author(firstnames='john p a' lastname='ioannidis' author(firstnames='jos' lastname='kleijnen' author(firstnames='tom' lastname='lang' author(firstnames='alessandro' lastname='liberati' author(firstnames='nicola' lastname='magrini' lastname='mcnamee' author(firstnames='lorenzo' lastname='moja' lastname='moher' author(firstnames='cynthia' lastname='mulrow' author(firstnames='maryann' lastname='napoli' author(firstnames='andy' lastname='oxman' lastname='pham' author(firstnames='drummond' lastname='rennie' author(firstnames='margaret' lastname='sampson' author(firstnames='kenneth f' lastname='schulz' initials='kf' author(firstnames='paul g' lastname='shekelle' initials='pg' author(firstnames='jennifer' lastname='tetzlaff' lastname='tovey' lastname='tugwell'