A case-control study of oral contraceptive use and breast cancer.
Hennekens CH, Speizer FE, Lipnick RJ, Rosner B, Bain C, Belanger C, Stampfer MJ, Willett W, Peto R.
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J Natl Cancer Inst. 1984 Jan;72(1):39-42. doi: 10.1093/jnci/72.1.39.
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PMID: 6363789
Clinical Trial.