1 Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine Ringgold Standard Institution, Birmingham, UK drm.marsden@yahoo.com.
2 Queen Mary University of London - Whitechapel Campus Ringgold Standard Institution, Queen Mary University of London, London, UK.
3 Risk and Information Systems Research Group, School of Electronic Engineering and Computer Science, Queen Mary University of London - Mile End Campus Ringgold Standard Institution, London, UK.
4 Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine Ringgold Standard Institution, Birmingham, UK.