database systematic TC done interpretation updated mckenzie addresse review org TITLE checklist indicating imprecision participant give preferably used topic guideline bmj CC included 2020 general report total BMJ result direction credible when inconsistency synthesi explicit wa 372 summary relevant http estimate creativecommon question n71 characteristic 1136 license bossuyt section eligibility mulrow JE brief PRISMA BY method indicate each interval ye source exclusion favoured outcome synthesise licensed present statement METHODS DISCUSSION work study under CD reported title comparing inclusion number date meta copy item evidence funding bia boutron last name view objective reporting primary identify MJ implication register effect doi 2021 specify limitation studie important criteria searched risk line PM confidence BACKGROUND visit page provide summarise information OTHER main registration analysi RESULTS group hoffmann asses