A trial of a one dose a month oral contraceptive.
D003276:Contraceptives, Oral / Q000008:administration & dosage*; D004997:Ethinyl Estradiol / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects; D010060:Ovulation / Q000187:drug effects; D011374:Progesterone / Q000008:administration & dosage*
D003276:Contraceptives, Oral; D004997:Ethinyl Estradiol; D011374:Progesterone