1. Department of Anaesthesiology; Oslo University Hospital; Oslo Norway
2. Department of Research and Development; Division of Emergencies and Critical Care; Oslo University hospital; Oslo Norway
3. Department of Anaesthesiology and Pain Medicine; Inselspital, Bern University Hospital; University of Bern; Bern Switzerland
4. Department of Anaesthesiology; University Hospital of North Norway; Tromsø Norway
5. Medical Faculty; University of Oslo; Oslo Norway