G Escolar, M Carretero, M Magallon, M Quintana, C Arnau, R Castillo, J Aznar-Salatti. von Willebrand factor contained in factor VIII concentrates of different purities supports platelet adhesion in blood samples from a heterogeneous group of patients with von Willebrand disease. Haematologica 1998;83(11):1009-1014; https://doi.org/10.3324/%x.