1. Department of Anaesthesia Oslo University Hospital Oslo Norway
2. Institute of Clinical Medicine Faculty of Medicine University of Oslo Norway
3. Department of Research and Development Division of Emergencies and Critical Care Oslo University Hospital Oslo Norway
4. Oslo Centre for Biostatistics and Epidemiology (OCBE) Research Support Services Oslo University Hospital Oslo Norway
5. Department of Anaesthesia, Intensive Care and Pain Medicine Orthopedic University Hospital Friedrichsheim Frankfurt Germany
6. Department of Anaesthesia and Pain Medicine Inselspital Bern University Hospital University of Bern Bern Switzerland