title: Hormonal contraception: current perspectives. Part I. An analysis of available agents.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003276:Contraceptives, Oral / Q000032:analysis; D003278:Contraceptives, Oral, Hormonal / Q000032:analysis; D004967:Estrogens / Q000032:analysis; D005260:Female; D006801:Humans; D011372:Progestins / Q000032:analysis
chemical_list: D003276:Contraceptives, Oral; D003278:Contraceptives, Oral, Hormonal; D004967:Estrogens; D011372:Progestins