1. Hazardous Area Response Team, South Western Ambulance Service Foundation Trust, Bristol, UK
2. Dorset and Somerset Air Ambulance, South Western Ambulance Service NHS Foundation Trust, Wellington, UK
3. South Western Ambulance Service Foundation Trust, Exeter, UK
4. Emergency Department, University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, UK
5. National Ambulance Response Unit, College of Policing, UK
6. Great Western Air Ambulance Charity, South Western Ambulance Service NHS Foundation Trust, Bristol, UK
7. Emergency Department, North Bristol NHS Trust, Bristol, UK