title: Oral contraceptives and thromboembolic episodes.
mesh_terms: D003276:Contraceptives, Oral / Q000009:adverse effects*; D004739:England; D005260:Female; D006801:Humans; D013923:Thromboembolism / Q000209:etiology*; D014852:Wales
chemical_list: D003276:Contraceptives, Oral