Thrombosis during pregnancy and surgery in patients with congenital deficiency of antithrombin III, protein C, protein S - De, SV; Leone, G; Mastrangelo, S; Tripodi, A; Rodeghiero, F; Castaman, G; Barbui, T; Finazzi, G; Bizzi, B; Mannucci, PM (Thromb Haemost, 1994)