1 The Regional Centre for Emergency Medical Research and Development (RAKOS), Stavanger University Hospital, Stavanger, Norway.
2 Department of Anaesthesiology and Intensive Care, Stavanger University Hospital, Stavanger, Norway.
3 Department of Clinical Medicine, University of Bergen, Bergen, Norway.
4 Department of Anaesthesia and Intensive Care Medicine. St. Olav's University Hospital. NO-7030 Trondheim, Norway.
5 Department of Circulation and Medical Imaging, Faculty of Medicine and Heath Sciences, Norwegian University of Science and Technology. NO-7491 Trondheim, Norway.
6 Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS), Division of Prehospital Services, Oslo University Hospital, Oslo, Norway.
7 Institute of Clinical Medicine, University of Oslo, Oslo, Norway.