1. Lovisenberg Diakonal Hospital; Oslo Norway
2. Faculty of Medicine; Institute of Clinical Medicine; University of Oslo; Oslo Norway
3. Research Institute of Internal Medicine; Oslo University Hospital; Oslo Norway
4. Division of Emergencies and Critical Care; Department of Pain Medicine and Research; Oslo University Hospital; Oslo Norway
5. Department of Surgical Sciences, Pain Medicine; Uppsala University; Uppsala Sweden
6. Division of Emergencies and Critical Care; Department of Research and Development; Oslo University Hospital; Oslo Norway