title: Incidence of severe von Willebrand's disease.
mesh_terms: D000328:Adult; D002170:Canada; D005060:Europe; D005260:Female; D006801:Humans; D007492:Iran; D007557:Israel; D008297:Male; D008875:Middle Aged; D014481:United States; D014842:von Willebrand Diseases / Q000453:epidemiology*