International Journal of Epidemiology · 2001 · 482 citations · 0 references
Public HealthBiostatisticsHealth SciencesClinical EpidemiologyEpidemiologic MethodsEpidemiologyClinical Trial DesignClinical TrialsClustered Data AnalysisRandomized Comparative TrialsRandomized Controlled TrialsStudy DesignCluster RandomizationCluster Randomization UnitsClustered Experimental DesignRandomizationRandomized Clinical Trials