Acquired von Willebrand's syndrome.
D000368:Aged; D005169:Factor VIII / Q000032:analysis; D006801:Humans; D008297:Male; D010314:Partial Thromboplastin Time; D010974:Platelet Aggregation; D012310:Ristocetin; D014842:von Willebrand Diseases / Q000097:blood*
D012310:Ristocetin; D005169:Factor VIII