title: Letter: Clot retraction in von Willebrand's disease.
mesh_terms: D003018:Clot Retraction; D006801:Humans; D009626:Terminology as Topic; D013917:Thrombin / Q000502:physiology; D014842:von Willebrand Diseases / Q000503:physiopathology*
chemical_list: D013917:Thrombin