Vitamin trials and cancer.
Wheatley
C
C
D002986:Clinical Trials as Topic; D006801:Humans; D009369:Neoplasms / Q000517:prevention & control*; D014815:Vitamins / Q000627:therapeutic use*; D019207:beta Carotene / Q000627:therapeutic use
D014815:Vitamins; D019207:beta Carotene