Risk of stroke in young women and two prothrombotic mutations: factor V Leiden and prothrombin gene variant (G20210A) - Longstreth, W; Rosendaal, F; Siscovick, D; Vos, H; Schwartz, S; Psaty, B; Raghunathan, T; Koepsell, T; Reitsma, P (Stroke, 1998)