Design of clinical trials for contraceptive steroids. Assessment of efficacy.
D000328:Adult; D003271:Contraceptive Agents, Female / Q000494:pharmacology; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003710:Demography; D004341:Drug Evaluation; D005193:Family Planning Services; D005260:Female; D005298:Fertility / Q000187:drug effects; D006801:Humans; D011155:Population Control; D012107:Research Design; D012959:Socioeconomic Factors
D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral