1. Department of Clinical Neuroscience, Institute of Neuroscience and Physiology at the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Department of Neurosurgery, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
3. Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
4. Department of Neurosurgery, Sahlgrenska University Hospital, Gothenburg, Sweden