Affiliation: | 1. Department of Anaesthesiology, Haugesund Hospital, Helse Fonna, Haugesund, Norway;2. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway;3. Norwegian Ministry of Trade, Industry and Fisheries, Oslo, Norway;4. Department of Anaesthesiology, Division of Emergencies and Critical Care, Oslo University Hospital, Rikshospitalet, Oslo, Norway |