Coinheritance of the HR2 haplotype in the factor V gene confers an increased risk of venous thromboembolism to carriers of factor V R506Q (Factor V Leiden) - Faioni, EM; Franchi, F; Bucciarelli, P; Margaglione, M; De Stefano, V; Casta-man, G; Finazzi, G; Mannucci, PM (Blood, 1999)