Case-control study of risk of cerebral sinus thrombosis in oral contraceptive users who are carriers of hereditary prothrombotic conditions

An error occurred in the title and abstract of this paper by S F T M de Bruijn and others (21 February, pp 589-92). The title should have been: Case-control study of risk of cerebral sinus thrombosis in oral contraceptive users and in carriers of hereditary prothrombotic conditions. The objective in the abstract was wrong in the same respect.