Among 989 cases of breast cancer and 9,890 controls selected from a cohort of married, female registered nurses aged 30-55 years, the relative risk (RR) of breast cancer for women who had ever used oral contraceptives (OC) compared with those who had never used them was 1.0, with 95
作者:C H, Hennekens;F E, Speizer;R J, Lipnick;B, Rosner;C, Bain;C, Belanger;M J, Stampfer;W, Willett;R, Peto
来源:Journal of the National Cancer Institute 1984 年 72卷 1期