title: Progestasert: a uterine therapeutic system for long-term contraception: I. Philosophy and clinical efficacy.
mesh_terms: D001706:Biopsy; D003267:Contraception / Q000379:methods*; D003276:Contraceptives, Oral / Q000008:administration & dosage; D003692:Delayed-Action Preparations; D004717:Endometrium / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D010298:Parity; D011374:Progesterone / Q000008:administration & dosage / Q000378:metabolism; D013997:Time Factors; D014626:Vaginal Smears
chemical_list: D003276:Contraceptives, Oral; D003692:Delayed-Action Preparations; D011374:Progesterone