Literatuurreferenties
1. Collaborative Group on Hormonal Factors in Breast Cancer. Breast cancer and hormonal contraceptives. Lancet 1996; 347: 1713-1727.
2. Marchbanks PA, et al. Oral contraceptives and the risk of breast cancer. N Engl J Med 2002; 346: 2025-2032.
3. Davidson NW, et al. Good news about oral contraceptives. N Engl J Med 2002; 346: 2078-2079.