The methylenetetrahydrofolate reductase TT677 genotype is associated with venous thrombosis independently of the coexistence of the FV Leiden and the prothrombin A20210 mutation - Margaglione, M; D’Andrea, G; D’Addedda, M; Giuliani, N; Cappucci, G; Iannaccone, L; Vecchione, G; Grandone, E; Brancaccio, V; Di Minno, G (Thromb Haemost, 1998)