title: Estrogens in oral contraceptives: historical perspectives.
mesh_terms: D003276:Contraceptives, Oral / Q000009:adverse effects*; D003278:Contraceptives, Oral, Hormonal / Q000009:adverse effects* / Q000266:history; D003279:Contraceptives, Oral, Sequential / Q000009:adverse effects*; D004967:Estrogens / Q000009:adverse effects*; D005260:Female; D049673:History, 20th Century; D006801:Humans; D007880:Legislation, Drug; D012449:Safety; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D003276:Contraceptives, Oral; D003278:Contraceptives, Oral, Hormonal; D003279:Contraceptives, Oral, Sequential; D004967:Estrogens