title: Letter: Thromboembolism and oral contraceptives.
mesh_terms: D001789:Blood Group Antigens; D003276:Contraceptives, Oral / Q000009:adverse effects*; D004347:Drug Interactions; D004967:Estrogens / Q000009:adverse effects; D005167:Factor VII / Q000032:analysis; D005260:Female; D006801:Humans; D011374:Progesterone / Q000009:adverse effects; D013923:Thromboembolism / Q000139:chemically induced*
chemical_list: D001789:Blood Group Antigens; D003276:Contraceptives, Oral; D004967:Estrogens; D011374:Progesterone; D005167:Factor VII