Oral contraceptives: epidemiologic problems. (The chairman's summary of a conference).
D003276:Contraceptives, Oral / Q000008:administration & dosage / Q000009:adverse effects*; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D013923:Thromboembolism / Q000139:chemically induced
D003276:Contraceptives, Oral