1. Department of Clinical Neuroscience, Institute of Physiology and Neuroscience, Sahlgrenska Academy, Gothenburg, Sweden
2. Department of Neurosurgery, Sahlgrenska University Hospital, Gothenburg, Sweden
3. Department of Neuromedicine and Movement Science, NTNU, Trondheim, Norway
4. Department of Neurosurgery, St.Olavs Hospital, Trondheim, Norway
5. Department of Public Health and Nursing, NTNU, Trondheim, Norway