WillebrandXpert - Professional practice survey Question Title * 1. What are your main criteria for the selection of a VWF concentrate for the treatment of your patients with von Willebrand disease? Question Title * 2. What factors could prevent you from using a pure VWF concentrate? Question Title * 3. In patients with von Willebrand disease, what criteria do you use to assess whether the patient should be put on long-term prophylaxis or not? Sports Frequency of bleeds Intensity of bleeds Sex Other (please specify) Question Title * 4. Any differences between adult and paediatric patients? Question Title * 5. - Before placing a patient on LTP, what PK parameters would you say are important for choosing the dose and frequency of injections? VWF:RCo VWF:Ag FVIII:C Other (please specify) Done