Type of postmenopausal hormone use and risk of breast cancer: 12-year follow-up from the Nurses' Health Study
Colditz GA, Stampfer MJ, Willett WC, Hunter DJ, Manson JE, Hennekens CH, Rosner B, Speizer FE. . Type of postmenopausal hormone use and risk of breast cancer: 12-year follow-up from the Nurses' Health Study. 1992; 63-77..