title: A brief history of the cluster randomised trial design.
authors.affiliation: Norwegian Knowledge Centre for the Health Services, N-0130 Oslo, Norway jenny.moberg@kunnskapssenteret.no.
authors.forename: Jenny
authors.initials: J
authors.lastname: Moberg
authors.affiliation: Norwegian Knowledge Centre for the Health Services, N-0130 Oslo, Norway McGill University, Montreal, Quebec, Canada H3A 0G4.
authors.forename: Michael
authors.initials: M
authors.lastname: Kramer
mesh_terms: D049670:History, 17th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000266:history*; D012106:Research / Q000266:history*