1. Department of Trauma And Orthopaedics, Addenbrookes Major Trauma Unit, Cambridge University Hospitals, Cambridge, United Kingdom
2. School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom
3. Barts Health NHS Trust, Whipps Cross University Hospital, Leytonstone, London, UK
4. Department of Trauma And Orthopaedics, Addenbrookes Major Trauma Unit, Cambridge University Hospitals, Cam-bridge, United Kingdom