Oral contraceptives.
D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000009:adverse effects*; D004997:Ethinyl Estradiol / Q000009:adverse effects; D005260:Female; D005306:Fertilization / Q000187:drug effects; D006801:Humans; D008656:Mestranol / Q000009:adverse effects; D009640:Norethindrone / Q000009:adverse effects; D011372:Progestins / Q000009:adverse effects; D013923:Thromboembolism / Q000139:chemically induced*
D003276:Contraceptives, Oral; D011372:Progestins; D004997:Ethinyl Estradiol; D008656:Mestranol; D009640:Norethindrone