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Cases of Malignant Neoplasm in the Beta Carotene Component of the Physicians' Health Study, According to Treatment Group and Years of Follow-up. Hennekens, C. H. et al. N Engl J Med 1996;334:1145-1149.
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Cases of Malignant Neoplasm in the Beta Carotene Component of the Physicians' Health Study, According to Treatment Group and Years of Follow-up Hennekens, C. H. et al. N Engl J Med 1996;334:1145-1149