1. Warwick Medical School, University of Warwick, Coventry, UK
2. College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK
3. Trauma Audit and Research Network, University of Manchester, Salford, Manchester, UK
4. Faculty of Medicine, Imperial College London, London, UK
5. Emergency Medicine Research in Sheffield (EMRiS), School of Health and Related Research, University of Sheffield, Sheffield, UK