title: Twenty years of oral contraception.
mesh_terms: D003267:Contraception; D003268:Contraception Behavior; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D005193:Family Planning Services; D007267:Injections; D010342:Patient Acceptance of Health Care; D012106:Research; D012922:Social Change
chemical_list: D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined
keywords: Clinical Research; Contraception; Contraceptive Methods--history; Contraceptive Methods--side effects; Contraceptive Usage; Family Planning; Injectables; Method Acceptability; Oral Contraceptives, Combined; Oral Contraceptives, Low-dose; Oral Contraceptives, Phasic; Oral Contraceptives--history; Oral Contraceptives--side effects; Social Change