title: Types of combined oral contraceptives used by US women.
authors: Mitchell D
authors: MD
authors: Creinin
mesh_terms: D003268:Contraception Behavior; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D003278:Contraceptives, Oral, Hormonal / Q000008:administration & dosage*; D045166:Estradiol Congeners / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D045167:Progesterone Congeners / Q000008:administration & dosage*
chemical_list: D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D045166:Estradiol Congeners; D045167:Progesterone Congeners