1. University of Oxford; Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences; Windmill Road, Headington Oxford UK OX3 7LD
2. University of Oxford; Oxford Clinical Trials Research Unit; NDORMS Windmill Road Oxford Oxfordshire UK OX3 7LD
3. Oxford University Hospitals NHS Trust; Nuffield Orthopaedic Centre; Windmill Road Oxford UK OX3 7LD