1. Oxford Trauma and Emergency Care, Kadoorie Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford , Oxford , UK
2. Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick , Coventry , UK
3. Buckinghamshire Healthcare NHS Trust, Stoke Mandeville Hospital , Aylesbury , UK
4. Oxford University Healthcare NHS Foundation Trust , Oxford , UK
5. Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford , Oxford , UK
6. Royal Cornwall Hospitals NHS Trust, Treliske , Truro, Cornwall , UK