1. Department of Physical Medicine and Rehabilitation, Oslo University Hospital, 0424 Oslo, Norway
2. Faculty of Health Sciences, Department of Clinical Medicine, UiT The Arctic University of Norway, Postboks 6050 Langnes, 9037 Tromsø, Norway
3. Department of Physical Medicine and Rehabilitation, University Hospital of North Norway, Postboks 100, 9038 Tromsø, Norway
4. Institute of Health and Society, Research Centre for Habilitation and Rehabilitation Models & Services (CHARM), Faculty of Medicine, University of Oslo, 0373 Oslo, Norway
5. Faculty of Health Sciences, Oslo Metropolitan University, 0130 Oslo, Norway
6. Oslo Centre for Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital, 0424 Oslo, Norway
7. Norwegian Trauma Registry, Division of Orthopaedic Surgery, Oslo University Hospital, 0424 Oslo, Norway
8. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0130 Oslo, Norway