title: Clinical trial with oral contraceptives.
mesh_terms: D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D004997:Ethinyl Estradiol; D005193:Family Planning Services; D019290:Megestrol Acetate; D012106:Research
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D004997:Ethinyl Estradiol; D019290:Megestrol Acetate
keywords: Clinical Research; Contraception; Contraceptive Agents; Contraceptive Agents, Estrogen; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods; Contraceptive Methods--side effects; Ethinyl Estradiol; Family Planning; Megestrol Acetate; Oral Contraceptives, Combined; Oral Contraceptives, Phasic; Oral Contraceptives--side effects; Research Methodology