Results of a screening for von Willebrand disease type 2N in patients with suspected haemophilia A or von Willebrand disease type I - Schneppenheim, R; Budde, U; Krey, S; Drewke, E; Bergmann, F; Lechler, E; Oldenburg, J; Schwaab, R (Thromb Haemost, 1996)