PAI-1 promoter 4G/5G genotype as an additional risk factor for venous thrombosis in subjects with genetic thrombophilic defects - Seguí, R; Estellés, A; Mira, Y; España, F; Villa, P; Falcó, C; Vayá, A; Grancha, S; Ferrando, F; Aznar, J (Brit J Haematol, 2000)