1 Academic Department of Military Emergency Medicine, Royal Centre for Defence Medicine (Research & Clinical Innovation), Birmingham, UK; Emergency Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK; Department of Research, Audit, Innovation, and Development (RAID), East Anglian Air Ambulance, Hangar E, Gambling Close, Norwich Airport, Norwich, UK. Electronic address: edward.barnard@nhs.net.
2 Samu 69, Hospices Civils de Lyon, Hôpital Édouard Herriot: 5 place d'Arsonval, 69003 Lyon, France.