1. Intensive Care Medicine and Pre-Hospital Emergency Medicine, Intensive Care Unit, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
2. Great Western Air Ambulance Charity, Emergency Air Operations Base, Bristol, UK
3. South West Critical Care Network, Bristol Royal Infirmary, Bristol, UK
4. Intensive Care Unit, Bristol Royal Infirmary, Bristol, UK
5. Emergency Care Research Group, University of the West of England Bristol, Bristol, UK
6. Intensive Care Unit, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
7. Severn Major Trauma Network, North Bristol NHS Trust, Southmead Hospital, Bristol, UK