title: Cycle control with a 21-day compared with a 24-day oral contraceptive pill: a randomized controlled trial.
authors.affiliation: Women's Healthcare, Bayer HealthCare Pharmaceuticals Inc., Wayne, New Jersey.
authors.forename: Richard F
authors.initials: RF
authors.lastname: Lynen
mesh_terms: D000736:Androstenes / Q000008:administration & dosage; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D004338:Drug Combinations; D004997:Ethinyl Estradiol / Q000008:administration & dosage; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000187:drug effects*; D009644:Norgestrel / Q000008:administration & dosage / Q000031:analogs & derivatives; D012102:Reproductive Control Agents / Q000008:administration & dosage
chemical_list: D000736:Androstenes; D003277:Contraceptives, Oral, Combined; D004338:Drug Combinations; D012102:Reproductive Control Agents; C534342:drospirenone and ethinyl estradiol combination; C109079:norgestimate, ethinyl estradiol drug combination; D009644:Norgestrel; D004997:Ethinyl Estradiol