1. Anesthesia and Critical Care Research Group; Department of Clinical Medicine; UiT; The Arctic University of Norway; 9037 Tromsø Norway
2. Department of Research and Education; Norwegian Air Ambulance Foundation; 1441 Drøbak Norway
3. Division of Surgical Medicine and Intensive Care; University Hospital of North Norway; 9038 Tromsø Norway
4. Department of Physiology & Biomedical Engineering; Mayo Clinic Rochester; MN USA