1. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
2. Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
3. Division of Medicine, Stavanger University Hospital, Stavanger, Norway.
4. Department of Physical Medicine and Rehabilitation, St. Olav's Hospital, Trondheim University Hospital, Trondheim, Norway.
5. Department of Neurosurgery, St. Olav's Hospital, Trondheim University Hospital, Trondheim, Norway.