1Faculty of Medicine, University of Oslo, Oslo, Norway
2Department of Neurosurgery, Oslo University Hospital, Oslo, Norway
3Division of Clinical Neuroscience, Department of Research and Innovation, Oslo University Hospital, P.O. Box 4956, 0424 Oslo, Nydalen, Norway
4Institute of Clinical Medicine, The Arctic University of Norway, Tromsø, Norway
5Department of Neurosurgery and The Norwegian Registry for Spine Surgery (NORspine), The University Hospital of North Norway, Tromsø, Norway
6Department of Rehabilitation and Technology, Faculty of Health Science, Oslo Metropolitan University, St. Olavs Plass, P.O. Box 4, 0130 Oslo, Norway
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