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Giovannucci E, Stampfer MJ, Colditz G, Rimm EB, Willett WC.Giovannucci E, et al.J Natl Cancer Inst. 1992 Jan 15;84(2):91-8. doi: 10.1093/jnci/84.2.91.J Natl Cancer Inst. 1992.PMID: 1310511
Grobbee DE, Rimm EB, Giovannucci E, Colditz G, Stampfer M, Willett W.Grobbee DE, et al.N Engl J Med. 1990 Oct 11;323(15):1026-32. doi: 10.1056/NEJM199010113231504.N Engl J Med. 1990.PMID: 2215561Free article.