Preventing Unintended Pregnancy: The Role of Hormonal Contraceptives. Symposium proceedings. Bethesda, Maryland, April 27-28, 1993.
D003270:Contraceptive Agents; D003278:Contraceptives, Oral, Hormonal; D006801:Humans
D003270:Contraceptive Agents; D003278:Contraceptives, Oral, Hormonal