1. Department of Clinical Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
2. Department of Neurosurgery, St. Olavs Hospital, Trondheim, Norway
3. Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
4. National Advisory Unit on Spinal Surgery, St. Olavs Hospital, Trondheim, Norway
5. Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway
6. Department of Neurosurgery and the Norwegian Registry for Spine Surgery (NORspine), University Hospital of North Norway, Tromsø, Norway
7. Australian Institute of Health Innovation, Macquarie University, Sydney, Australia