1 Centre for Trauma Sciences, Blizard Institute, Queen Mary University of London, London, UK; Royal London Major Trauma Centre, Barts Health NHS Trust, London, UK.
2 Centre for Trauma Sciences, Blizard Institute, Queen Mary University of London, London, UK; London's Air Ambulance, Royal London Hospital, London, UK; Royal London Major Trauma Centre, Barts Health NHS Trust, London, UK.
3 Centre for Trauma Sciences, Blizard Institute, Queen Mary University of London, London, UK; NHS Blood & Transplant, London, UK; Royal London Major Trauma Centre, Barts Health NHS Trust, London, UK.