1. Emergency Department, Vestfold Hospital Trust, Halfdan Wilhelmsens Allé 17, No. 3103 Tønsberg, Norway
2. Welfare and Organization, Østfold University College, P.O. Box 700, No. 1757 Halden, Norway
3. Department of Anesthesiology, Division of Emergencies and Critical Care, Oslo University Hospital, No. 0454 Oslo, Norway
4. Department of Anesthesiology, Vestfold Hospital Trust, Halfdan Wilhelmsens Allé 17, No. 3103 Tønsberg, Norway
5. Oslo Center for Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital, PB 4950 Nydalen, No. 0424 Oslo, Norway
6. Faculty of Health and Social Sciences, University of South‐Eastern Norway, Raveien 215, No. 3184 Borre, Norway