1. Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Oslo, Norway
2. Institute of Health and Society, Research Centre for Habilitation and Rehabilitation Models & Services (CHARM), Faculty of Medicine, University of Oslo, Oslo, Norway
3. Oslo Centre of Biostatistics and Epidemiology Research Support Services, Oslo University Hospital, Oslo, Norway
4. Department of Psychology, University of Oslo, Oslo, Norway
5. Department of Physiotherapy, Faculty of Health Sciences, OsloMet – Oslo Metropolitan University, Oslo, Norway