Seqential oral contraception.
D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D003276:Contraceptives, Oral / Q000008:administration & dosage; D004997:Ethinyl Estradiol / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D008525:Medroxyprogesterone / Q000008:administration & dosage*; D008598:Menstruation / Q000187:drug effects; D010919:Placebos; D011247:Pregnancy
D003276:Contraceptives, Oral; D010919:Placebos; D004997:Ethinyl Estradiol; D008525:Medroxyprogesterone