1. Benign Hematology Center, Van Creveldkliniek, University Medical Center Utrecht, University Utrecht, Utrecht, The Netherlands;
2. Sheffield Haemophilia and Thrombosis Centre, Royal Hallamshire Hospital, Sheffield, United Kingdom;
3. Department of Haematology, Royal Infirmary, Glasgow, United Kingdom;
4. Katharine Dormandy Haemophilia and Thrombosis Centre Royal Free Hospital, London, United Kingdom;
5. Arthur Bloom Haemophilia Centre, University Hospital of Wales School of Medicine, Cardiff University, Cardiff, United Kingdom; and
6. Department of Haematology, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands