Cycle control with a 21-day compared with a 24-day oral contraceptive pill: a randomized controlled trial.
Richman
Susan
S
Department of Obstetrics, Gynecology and Reproductive Science, Yale School of Medicine, New Haven, Connecticut.
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
D003277:Contraceptives, Oral, Combined