| http://www.w3.org/ns/prov#value | - A cohort of 16 804 male smokers aged 50 ??? 69 years and working at study entry was drawn from the Alpha-Tocopherol, Beta-Carotene Cancer Prevention (ATBC) Study, which examined the effect of vitamin E, 50 mg/day, and ??-carotene, 20 mg/day, on lung and other cancers.
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