title: WHO leads global effort on systematic reviews.
authors.forename: J
authors.initials: J
authors.lastname: Villar
authors.forename: A P
authors.initials: AP
authors.lastname: Betrán
authors.forename: A M
authors.initials: AM
authors.lastname: Gülmezoglu
authors.forename: L
authors.initials: L
authors.lastname: Say
mesh_terms: D016208:Databases, Factual; D019317:Evidence-Based Medicine / Q000379:methods / Q000592:standards*; D006801:Humans; D015201:Meta-Analysis as Topic; D012196:Review Literature as Topic; D014944:World Health Organization