A prospective cohort study of postmenopausal hormone use and risk of breast cancer in US women. by Buring, J, Hennekens, C, Lipnick, R, Willett, W, Stampfer, M, Rosner, B, Peto, R, Speizer, F

A case-control study of oral contraceptive use and breast cancer. by Hennekens, C, Speizer, F, Lipnick, R, Rosner, B, Bain, C, Belanger, C, Stampfer, M, Willett, W, Peto, R

Oral contraceptives and breast cancer. A prospective cohort study. by Lipnick, R, Buring, J, Hennekens, C, Rosner, B, Willett, W, Bain, C, Stampfer, M, Colditz, G, Peto, R, Speizer, F