1. Haemophilia Centre and Thrombosis Unit; Royal Free London NHS Foundation Trust; London UK
2. Centre for Haematology, Imperial College Academic Health Sciences Centre; Imperial College London; London UK
3. Molecular Haematology Service; Manchester University NHS Foundation Trust; Manchester UK
4. Oxford Haemophilia and Thrombosis Centre, Oxford University Hospitals NHS Foundation Trust, and NIHR BRC Blood Theme; Oxford University; Oxford UK
5. Centre for Child & Adolescent Health; University of Bristol; Bristol UK