title: Letter: A method for assaying von Willebrand factor (ristocetin cofactor).
mesh_terms: D001779:Blood Coagulation Factors / Q000032:analysis*; D005557:Formaldehyde; D006801:Humans; D008722:Methods; D010974:Platelet Aggregation; D012310:Ristocetin; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D001779:Blood Coagulation Factors; D014841:von Willebrand Factor; D012310:Ristocetin; D005557:Formaldehyde