title: Cycle control with a 21-day compared with a 24-day oral contraceptive pill: a randomized controlled trial.
authors.affiliation: Department of Obstetrics, Gynecology and Reproductive Science, Yale School of Medicine, New Haven, Connecticut.
authors.forename: Susan
authors.initials: S
authors.lastname: Richman
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000187:drug effects*; D008796:Metrorrhagia / Q000517:prevention & control
chemical_list: D003277:Contraceptives, Oral, Combined