1. Department of Haematology, University Hospital of Wales, School of Medicine, Cardiff, United Kingdom;
2. The UK National Haemophilia Database, Manchester, United Kingdom;
3. Department of Haematology, Royal Hospital for Sick Children, Glasgow, United Kingdom;
4. The Haemophilia Centre, The Royal London Hospital, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, United Kingdom;
5. The Haemophilia Centre, Great Ormond Street Hospital for Children National Health Service Foundation Trust, London, United Kingdom;
6. The Centre for Haemostasis and Thrombosis, Guys and St. Thomas’s Hospital, London and the Haemophilia, Haemostasis and Thrombosis Centre, Hampshire Hospitals National Health Service Foundation Trust, Basingstoke, United Kingdom;
7. Department of Haematology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom;
8. Department of Haematology, Birmingham Children’s Hospital National Health Service Foundation Trust, Birmingham, United Kingdom; and
9. Department of Haematology, Manchester University, Manchester Royal Infirmary, Manchester, United Kingdom