1. Department of Health Management and Health Economics, Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
2. Department of Orthopedic Surgery, Akershus University Hospital, University of Oslo, Oslo, Norway
3. Department of General Practice, Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
4. Department of Nursing, Faculty of Health Sciences, Oslo and Akershus University College of Applied Sciences, Oslo, Norway
5. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
6. The Intervention Centre, Oslo University Hospital, Oslo, Norway