title: Diabetes education: Selection bias in cluster trial.
authors.forename: David J
authors.initials: DJ
authors.lastname: Torgerson
mesh_terms: D016000:Cluster Analysis; D003924:Diabetes Mellitus, Type 2 / Q000517:prevention & control*; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D015983:Selection Bias