A multicenter study of levonorgestrel-estradiol contraceptive vaginal rings. I-Use effectiveness. An international comparative trial.
D000152:Acne Vulgaris / Q000209:etiology; D000293:Adolescent; D000328:Adult; D003274:Contraceptive Devices, Female / Q000009:adverse effects; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage; D004958:Estradiol / Q000008:administration & dosage*; D004997:Ethinyl Estradiol / Q000008:administration & dosage; D019304:Ethinyl Estradiol-Norgestrel Combination; D005260:Female; D006801:Humans; D007973:Leukorrhea / Q000209:etiology; D016912:Levonorgestrel; D008599:Menstruation Disturbances / Q000209:etiology; D009644:Norgestrel / Q000008:administration & dosage*; D011247:Pregnancy; D013223:Statistics as Topic; D014621:Vagina
D003277:Contraceptives, Oral, Combined; D009644:Norgestrel; D004997:Ethinyl Estradiol; D004958:Estradiol; D016912:Levonorgestrel; D019304:Ethinyl Estradiol-Norgestrel Combination