1. Department of Haematology; Royal Hospital for Children; Glasgow UK
2. Department of Paediatric Haematology; Evelina Children's Hospital; London UK
3. School of Medicine; Cardiff University; Cardiff UK
4. Department of Haematology; Great Ormond Street Hospital for Children NHS Trust; London UK
5. Department of Haematology; Sheffield Children's Hospital; Sheffield UK
6. Department of Haematology; Leeds Children's Hospital; Leeds UK
7. Bristol Haemophilia Comprehensive Care Centre; Bristol Royal Hospital for Children; Bristol UK
8. Haemophilia Centre; Birmingham Childrens' Hospital; Birmingham UK
9. The National Haemophilia Database; Manchester UK
10. Department of Cellular and Molecular Medicine; University of Bristol; Bristol UK