title: Letter: Oral contraceptives and risks of thromboembolism.
mesh_terms: D002561:Cerebrovascular Disorders / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D002542:Intracranial Embolism and Thrombosis / Q000139:chemically induced; D008433:Mathematics; D011336:Probability; D013223:Statistics as Topic; D013923:Thromboembolism / Q000139:chemically induced*
chemical_list: D003276:Contraceptives, Oral