title: The design of cancer prevention trials.
authors.affiliation: Biometry Branch, National Cancer Institute, Bethesda, MD 20892-4200.
authors.forename: D P
authors.initials: DP
authors.lastname: Byar
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D015331:Cohort Studies; D005163:Factor Analysis, Statistical; D006801:Humans; D009369:Neoplasms / Q000209:etiology / Q000517:prevention & control*; D011897:Random Allocation; D012307:Risk Factors