1. An epidemiological study of recent trends in ectopic pregnancy;Beral, V.;BrJ_ Obstet Gynaecol,1975
2. Incidence, trends, and risks of ectopic pregnancy in a population of women. BM3';Westrom, L.; Bengtsson, L.P.; Mardh, P.-A.,1981
3. Ectopic pregnancies: rising incidence rates in northern california;Shiono, P.H.; Harlap, S.; Pellegrin, F.;Am J Public Health,1982
4. Epidemiology of ectopic pregnancy;Chow, W.-H.; Daling, JR, Cates; W, Greenberg; R.S.;Epidemiol Rev,1987
5. Center for disease control. Ectopic pregnancy-United States 1981-1983;MMWR,1993