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Malila N, Virtamo J, Virtanen M, Pietinen P, Albanes D, Teppo L. Dietary and serum α-tocopherol, β-carotene and retinol, and risk for colorectal cancer in male smokers. European Journal of Clinical Nutrition. 2002 Jun 25;56(7):615–21. doi: 10.1038/sj.ejcn.1601366. |