1. Department of Physical Medicine and Rehabilitation, Oslo University Hospital Ulleval, Oslo, Norway.
2. Institute of Health and Society, Research Centre for Habilitation and Rehabilitation Models and Services, Faculty of Medicine, University of Oslo, Oslo, Norway.
3. University of Deusto. IKERBASQUE, Basque Foundation for Science. Bilbao, Spain.
4. Department of Psychology, Virginia Commonwealth University, Richmond, Virginia.
5. Sunnaas Rehabilitation Hospital Trust, Akershus, Norway.
6. Department of Epidemiology and Community Health, Virginia Commonwealth University, Richmond, Virginia.
7. Department of Psychology, University of Deusto, Bilbao, Spain.
8. Faculty of Medicine, University of Oslo, Oslo, Norway.