Discrimination of von Willebrand's disease (vWD) subtypes: direct comparison of von Willebrand factor:collagen binding activity/assay (vWF:CBA) with monoclonal antibody (MAB) based ELISA vWF-detection systems - Favaloro,E.J.; Henniker,A.; Facey,D.; Hertzberg,M. (Thromb Haemost, 2000)