1. Department of Emergency Medicine and Pre-Hospital Services, St Olav's University Hospital, Trondheim, Trondheim, Norway
2. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Trondheim, Norway
3. Department of Research and Development, Norwegian Air Ambulance Foundation, Drøbak, Trondheim, Norway
4. Department of Public Health, Faculty of Medicine and Health Sciences, NTNU, Norwegian University of Science and Technology, Trondheim, Norway
5. Department of Anaesthesiology, Division of Emergencies and Critical Care, Oslo University Hospital, Rikshospitalet, Oslo, Norway
6. Department of Anaesthesiology and Intensive Care Medicine, St Olav's University Hospital, Trondheim, Trondheim, Norway