REFERENCES
- World Health Organization (Division of Reproductive Health). Safer Motherhood: Progress Report 1993-1995. Geneva: WHO, 1996
- Sturridge F, Guillebaud J. A risk-benefit assessment of the levonorgestrel-releasing intrauterine system. Drug Safety 1996;15:430–40
- Sturridge F, Guillebaud J. Gynaecological aspects of the levonorgestrel-releasing intrauterine system. Br J Obstet Gynaecol 1997;104:285–9
- Kubba A. A new thinking in contraception. Practitioner 1991;235:878–82
- Andersson K, Odlind V, Rybo G. Levonorgestrel-releasing and copper-releasing (Nova T) IUDs during 5 years of use: a randomised comparative trial. Contraception 1994;49:56–72
- Toivonen J, Luukkainen T, Alionen H. Protective effect of intrauterine release of levonorgestrel on pelvic infection: three years' comparative experience of levonorgestrel- and copper-releasing intrauterine devices. Obstet Gynecol 1991;77:261–4
- Haukkamaa M, Stranden P, Jousimies-Somer H, et al. Bacterial flora of the cervix in women using different methods of contraception. AmJ Obstet Gynecol 1986;154: 520–4
- Sivin I, Stern J. Health during prolonged use of levonorgestrel 20 micrograms/d and the copper Tcu 380Ag intrauterine contraceptive devices: a multicenter study. International Committee for Contraception Research (ICCR). Fértil Steril 1994;61:70–7
- Nilsson CG, Lahteenmâki P. Recovery of ovarian function after the use of a d-norgestrel-releasing IUD. Contraception 1977;15:389–400