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The von Willebrand Disease Prophylactic Network (vWD PN) has been initiated to study the natural history of vWD bleeding, and to prospectively study the role of von Willebrand Factor (vWF) concentrate prophylaxis in vWD. Patients with all types of vWD in need of treatment with vWF concentrate will be enrolled into the study. Quality of life will be measured and safety and efficacy will be monitore
