1. Oxford Haemophilia and Thrombosis Centre, Oxford University Hospital NHS Foundation Trust, UK
2. Physiotherapy Research Unit, Nuffield Orthopaedic Centre, Oxford University Hospital NHS Foundation Trust, UK
3. Faculty of Health Sciences, University of Southampton, Southampton, UK
4. Nuffield Department of Orthopaedics and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK