title: Plasma factor IX levels and oral contraception.
mesh_terms: D002715:Chlormadinone Acetate / Q000494:pharmacology; D003276:Contraceptives, Oral / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology; D005164:Factor IX / Q000032:analysis*; D005260:Female; D006801:Humans; D008656:Mestranol / Q000494:pharmacology; D009640:Norethindrone / Q000494:pharmacology; D011374:Progesterone / Q000494:pharmacology
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens; D002715:Chlormadinone Acetate; D011374:Progesterone; D005164:Factor IX; D008656:Mestranol; D009640:Norethindrone