Factor VII deficiency: immunological characterization of genetic variants and detection of carriers - Mariani, G; Mazzucconi, M G; Hermans, J; Ciavarella, N; Faiella, A; Hassan, H J; Mannucci, P M; Nenci, G G; Orlando, M; Romoli, D; Mandelli, F (Br J Haematol, 1981)