1. Faculty of Medicine Institute of Clinical Medicine University of Oslo Oslo Norway
2. Department of Acute Medicine Oslo University Hospital Oslo Norway
3. Department of Anesthesiology Oslo University Hospital Oslo Norway
4. Department of Anesthesiology Diakonhjemmet Hospital Oslo Norway
5. Department of Postoperative and Intensive care Oslo University Hospital Oslo Norway
6. Department of Biostatistics and Epidemiology Oslo University Hospital Oslo Norway
7. Department of Cardiology Oslo University Hospital Oslo Norway
8. Division of Prehospital Services Oslo University Hospital Norwegian Air Ambulance Foundation Oslo Norway