Hong Kong: oral contraceptive follow-up study.
D000328:Adult; D000367:Age Factors; D003276:Contraceptives, Oral / Q000592:standards; D004522:Educational Status; D004651:Employment; D005260:Female; D005500:Follow-Up Studies; D006723:Hong Kong; D006801:Humans; D007434:Intrauterine Devices / Q000592:standards / Q000706:statistics & numerical data; D010298:Parity; D011247:Pregnancy; D013997:Time Factors
D003276:Contraceptives, Oral