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