title: The Cochrane collaboration at 20.
authors.affiliation: London SW4 0LD, UK.
authors.forename: Richard
authors.initials: R
authors.lastname: Smith
mesh_terms: D016206:Databases, Bibliographic; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D007391:International Cooperation; D008297:Male; D015201:Meta-Analysis as Topic; D011787:Quality of Health Care; D012196:Review Literature as Topic