References
- Aznar R., Berry C. L., Coone I. D., Gray R., McNicol G. P., Newton J. R., Pizzaro E., Rowe P. J., Shaw S. T., Jr., Wagatsuma T., Webb F., Wilson E. Ectopic pregnancy rates in IUD users. Br Med J 1978; 1: 785
- Erkkola R., Liukko P. Intrauterine device and ectopic pregnancy. Contraception 1977; 16: 569
- Hallatt J. G. Ectopic pregnancy associated with the intrauterine device: A study of seventy cases. Am J Obstet Gynecol 1976; 125: 754
- Lehfeldt H., Tietze C., Gorstein F. Ovarian pregnancy and the intrauterine device. Am J Obstet Gynecol 1970; 108: 1005
- Luukkainen T., Nielsen N.-C., Nygren K.-G., Pyörälä T., Kosonen A. Randomized comparison of clinical performance of two copper-releasing IUDs, Nova T and Copper-T-200. Contraception 1979; 19: 1
- Mishell D. R., Jr. Current status of contraceptive steroids and intrauterine device. Clin Obstet Gynecol 1974; 17: 35
- Tatum H. J., Schmidt F. H. Contraceptive and sterilization practices and extrauterine pregnancy: A realistic perspective. Fertil Steril 1977; 28: 407
- Vessey M., Doll R., Peto R., Johson B., Wiggins P. A long-term follow-up study of women using different methods of contraception an interim report. J Biosoc Sci 1976; 8: 373
- Official Statistics of Sweden: Population. National Central Bureau of Statistics, Stockholm 1974, Part 3, 1977
- Official Statistics of Sweden: Population Changes. National Central Bureau of Statistics, Stockholm 1974, Part 3, 1977
- Official Statistics of Sweden: Abortions 1973–1974 S 1975:27, Abortions 1975 HS 1977:3, Abortions 1976 HS 1978:2, Induced abortions January December 1977 HS 1978:7. National Central Bureau of Statistics, Stockholm