Risk of Cerebral Sinus Thrombosis in Oral Contraceptive Users Who Are Carriers of Hered Prothrombotic CondBMJ 316:589-592, deBruijn,S.F.T.M.,et al, 1998
Protein S Deficiency in Middle-Aged Women with StrokeNeurol 42:1029-1033, Green,D.,et al, 1992