title: Study on the influence of etretinate on biologic activity of oral contraceptives.
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000494:pharmacology*; D005050:Etretinate / Q000494:pharmacology*; D005260:Female; D006801:Humans; D011374:Progesterone / Q000097:blood*
chemical_list: D003277:Contraceptives, Oral, Combined; D011374:Progesterone; D005050:Etretinate