title: Comparative clinical trial of two oral contraceptives with a low--estrogen content.
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000494:pharmacology; D004361:Drug Tolerance; D004997:Ethinyl Estradiol / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008234:Lynestrenol / Q000494:pharmacology*
chemical_list: D003277:Contraceptives, Oral, Combined; D004997:Ethinyl Estradiol; D008234:Lynestrenol