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Contraception|February 1, 1997
Levonorgestrel concentrations during use of levonorgestrel rod (LNG ROD) implantsI Sivin, P Lähteenmäki, S Ranta, et al.Contraception|April 1, 1997
Contraceptives for lactating women: a comparative trial of a progesterone-releasing vaginal ring and the copper T 380A IUDI Sivin, S Díaz, H B Croxatto, et al.Contraception|October 1, 1981
A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. III-Menstrual patterns. An international comparative trialI Sivin, D R Mishell, A Victor, et al.Contraception|October 1, 1981
A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. II-Subjective and objective measures of effects. An international comparative trialI Sivin, D R Mishell, A Victor, et al.Pageof 23