Coexistence of factor V Leiden and factor II A20210 mutations and recurrent venous thromboembolism - Margaglione, M; D’Andrea, G; Colaizzo, D; Cappucci, G; del Popolo, A; Brancaccio, V; Ciampa, A; Grandone, E; Di Minno, G (Thromb Haemost, 1999)