title: Statistics notes. Trials randomised in clusters.
authors.affiliation: Department of Public Health Sciences, St George's Hospital Medical School, London.
authors.forename: J M
authors.initials: JM
authors.lastname: Bland
authors.forename: S M
authors.initials: SM
authors.lastname: Kerry
mesh_terms: D016000:Cluster Analysis; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design