Comparative study of intrauterine contraceptive devices.
D000328:Adult; D001706:Biopsy; D003273:Contraceptive Devices; D003276:Contraceptives, Oral; D004717:Endometrium; D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000188:drug therapy; D009641:Norethynodrel; D011247:Pregnancy
D003276:Contraceptives, Oral; D009641:Norethynodrel