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Kawachi I, Colditz GA, Stampfer MJ, Willett WC, Manson JE, Rosner B, Speizer FE, Hennekens CH.Kawachi I, et al. Among authors: willett wc.Arch Intern Med. 1994 Jan 24;154(2):169-75.Arch Intern Med. 1994.PMID: 8285812
Giovannucci E, Stampfer MJ, Colditz G, Rimm EB, Willett WC.Giovannucci E, et al. Among authors: willett wc.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