1. Department of Physical Medicine and Rehabilitation, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
2. Institute of Health and Society, Research Centre for Habilitation and Rehabilitation Models & Services (CHARM), Faculty of Medicine, University of Oslo, P.O. Box 1072 Blindern, N-0316 Oslo, Norway
3. Department of Clinical Medicine, Faculty of Health Sciences, UiT the Arctic University of Norway, P.O. Box 6050 Langnes, N-9037 Tromsø, Norway
4. Department of Rehabilitation, University Hospital of North Norway, P.O. Box 100, N-9038 Tromsø, Norway
5. Faculty of Health Sciences, Oslo Metropolitan University, P.O. Box 4, St. Olavs Plass, N-0130 Oslo, Norway
6. Norwegian Trauma Registry, Division of Orthopaedic Surgery, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
7. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, P.O. Box 1072 Blindern, N-0316 Oslo, Norway
8. Department of Traumatology, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
9. Department of Neurosurgery, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
10. Department of Child Neurology, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
11. Division of Emergencies and Critical Care, Department of Research and Development, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
12. Oslo University Hospital Trauma Registry, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway
13. Oslo Centre for Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424 Oslo, Norway