1. Department of Circulation and Medical Imaging; Faculty of Medicine; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Pharmacoepidemiology; Division of Epidemiology; The Norwegian Institute of Public Health; Oslo Norway
3. Norwegian Centre for Addiction Research; University of Oslo; Oslo Norway
4. National Competence Centre for Complex Symptom Disorders; Department of Pain and Complex Disorders; St. Olav University Hospital; Trondheim Norway
5. Department of Emergency Medicine; St. Olav University Hospital; Trondheim Norway
6. Department of Public Health and General Practice; Faculty of Medicine; Norwegian University of Science and Technology; Trondheim Norway
7. Centre of Palliative Care; Surgical Division; Akershus University Hospital; Nordbyhagen Norway