Risk modification in multifactorial studies: implications for cancer control.
D004812:Epidemiologic Methods; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology / Q000517:prevention & control; D009369:Neoplasms / Q000175:diagnosis / Q000209:etiology* / Q000517:prevention & control*; D012306:Risk; D012907:Smoking; D014801:Vitamin A / Q000627:therapeutic use
D014801:Vitamin A