1. Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway.
2. Department of Neurosurgery, St. Olav University Hospital, Trondheim, Norway.
3. Department of Medical Imaging, St. Olav University Hospital, Trondheim, Norway.
4. Department of Physical Medicine and Rehabilitation, St. Olav University Hospital, Trondheim, Norway.