title: On meta-analyses of meta-analyses.
authors.forename: J P
authors.initials: JP
authors.lastname: Ioannidis
authors.forename: J
authors.initials: J
authors.lastname: Lau
mesh_terms: D002985:Clinical Protocols; D002986:Clinical Trials as Topic / Q000379:methods*; D007600:Judgment; D015201:Meta-Analysis as Topic; D018579:Patient Selection; D011897:Random Allocation; D018570:Risk Assessment