“Pseudo Homozygous” activated protein C resistance due to double heterozygous factor V defects (factor V Leiden mutation and type I quantitative factor V defect) associated with thrombosis: report of two cases belonging to two unrelated kindreds - Simioni, P; Scudeller, A; Radossi, P; Gavasso, S; Girolami, B; Tormene, D; Girolami, A (Thromb Haemost, 1996)