References
- Sivin I. International experience with Norplant® and Norplant®-2 contraceptives. Stud Fam Plann 1988; 19:81–94
- Sivin I, Lähteenmäki P, Mishell DR Jr, et at. First week drug concentrations in women with levonor-gestrel rod or Norplant® capsule implants. Contracep-tion 1997;56:317–21
- Sivin I, Lähteenmäki P, Ranta S, et al. Levonorgestrel concentrations during use of levonorgestrel rod (LNG ROD) implants. Contraception 1997;55:81–5
- Diaz S, Pavez M, Miranda P, Johansson EDB, Croxatto HB. Long-term follow-up of women treated with Norplant® implants. Contraception 1987; 35:551–67
- Sivin I, Campodonico I, Kiriwat 0, et al. The performance of levonorgestrel rod and Norplant® contraceptive implants: a 5 year randomized study. Hum Reprod 1998;13: 3371–8