1. Oxford Trauma and Emergency Care, Nuffield Department of Orthopaedic Rheumatology and Musculoskeletal Sciences; University of Oxford; Oxford UK
2. Oxford University Clinical Academic Graduate School; University of Oxford, John Radcliffe Hospital; Oxford UK
3. Statistics & Epidemiology Unit; Warwick Medical School; Coventry UK
4. Bone and Joint Health, Blizard Institute; Queen Mary University of London; London UK
5. Barts Health NHS Trust; London UK