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