1. Functional ovarian cysts and oral contraceptives;Study, Boston Collaborative Drug Surveillance;JAMA,1974
2. A long-term follow-up study of women using different methods of contraception-an interim report;Vessey, M.; Doll, R.; Peto, R.;J Biosoc Sci,1976
3. Risk of ectopic pregnancy;Robinson, N.; Beral, V.;Lancet,1979
4. Trends in pelvic inflammatory disease in England and Wales;Robinson, N.; Beral, V.; Ashley, J.;J Epidemiol Community Health,1981
5. Oral contraceptives in the 1980s. Popul Rep [A];Kols, A.; Rinehart, W.; Piotrow, P.T.; Doucette, L.; Guillin, W.F.,1982