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 pmid:19621072 pmc2707599 doi:10.1371/journal.pmed.1000097 david moher alessandro liberati prisma group evidence-based practice / standards meta-analysis as topic* periodicals as topic / standards publication bias publishing / standards* quality control review literature as topic* metaanalysis systematic reviews publication ethics database searching medical journals medical risk factors research reporting guidelines clinical research design 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'