1. Department of Circulation and Medical Imaging Norwegian University of Science and Technology Trondheim Norway
2. Division of Prehospital Services Oslo University Hospital Oslo Norway
3. Department of Research and Development The Norwegian Air Ambulance Foundation Oslo Norway
4. Department of Emergency Medicine and Pre‐Hospital Services, St. Olav's Hospital Trondheim University Hospital Trondheim Norway
5. Oslo Centre for Biostatistics and Epidemiology Oslo University Hospital Oslo Norway