REFERENCES
- Vessey M, Doll R, Peto R, . A long-term follow- up study of women using different methods of contraception. J Biosoc Sci 1976;8:373–427.
- Royal College of General Practitioners. Oral contraceptives and health. London: Pitman Medical 1974.
- Royal College of General Practitioners’ Oral Contraception Study. Mortality among oral contraceptive users. Lancet 1977;ii:727–31.
- Vessey MP, McPherson K, Johnson B. Mortality among women participating in the Oxford/Family Planning Association Contraceptive Study. Lancet 1977;ii: 731–3.
- Royal College of General Practitioners’ Oral Contraception Study. Further analyses of mortality in oral contraceptive users. Lancet 1981;i:541–6.
- Vessey MP, McPherson K, Yeates D. Mortality in oral contraceptive users. Lancet 1981;i:549–50.
- Vessey MP, Villard-Mackintosh L, McPherson K, Yeates D. Mortality among oral contraceptive users: 20 year follow up of women in a cohort study. BMJ 1989;299:1487–91.
- Colditz GA, for The Nurses’ Health Study Research Group. Oral contraceptive use and mortality during 12 years of follow-up: the Nurses’ Health Study. Ann Intern Med 1994;120:821–6.
- Beral V, Hermon C, Kay C, . Mortality associated with oral contraceptive use: 25 year follow up of cohort of 46 000 women from Royal College of General Practitioners’ oral contraception study. BMJ 1999; 318:96–100.
- Hannaford PC, Iversen L, MacFarlane TV, . Mortality among contraceptive pill users: Cohort evidence from Royal College of General Practitioner's Oral Contraception Study. BMJ 2010;340:c927.
- Vessey M, Yeates D, Flynn S. Factors affecting mortality in a large cohort study with special reference to oral contraceptive use. Contraception 2010;82:221–9.
- Britt K, Short R. The plight of nuns: Hazards of nulliparity. Lancet 2012;379:2322–3.