Enrollment begins for largest-ever prostate cancer prevention trial.
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D002170:Canada; D002986:Clinical Trials as Topic; D006801:Humans; D008297:Male; D015337:Multicenter Studies as Topic; D011471:Prostatic Neoplasms / Q000517:prevention & control*; D011647:Puerto Rico; D012643:Selenium / Q000627:therapeutic use*; D014481:United States; D014810:Vitamin E / Q000627:therapeutic use*
D014810:Vitamin E; D012643:Selenium