title: Cluster-randomized controlled trials: Part 2.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Pandis
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D012107:Research Design / Q000706:statistics & numerical data*