The importance and nature of cancer prevention trials.
Byar
D P
DP
Biometry Branch, National Cancer Institute, Bethesda, MD 20892.
Freedman
L S
LS
D002986:Clinical Trials as Topic; D006801:Humans; D009369:Neoplasms / Q000453:epidemiology / Q000517:prevention & control*; D010349:Patient Compliance; D012107:Research Design