Statistical designs for investigating several interventions in the same study: methods for cancer prevention trials.
Freedman
L S
LS
Division of Cancer Prevention and Control, National Cancer Institute, Bethesda, MD 20892.
Green
S B
SB
D002986:Clinical Trials as Topic / Q000379:methods; D006801:Humans; D009369:Neoplasms / Q000517:prevention & control*; D012107:Research Design; D013223:Statistics as Topic / Q000379:methods*