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beta-Carotene and Retinol Efficacy Trial is a nationwide chemoprevention trial that recruited 18,314 high-risk individuals to test the effect of supplemental beta-carotene and retinol on lung cancer(More)
1 The symposium participants deserve many thanks for putting up with my relentless questions in good humor. I also appreciate their helpful comments on an earlier draft of this paper. Thanks also to(More)