1. Department of Radiation Sciences, Biomedical Engineering, Umeå University, Umeå, Sweden;
2. Department of Pharmacology and Clinical Neuroscience, Umeå University, Umeå, Sweden;
3. Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden;
4. Department of Neurosurgery, University Hospital, Lund, Sweden;
5. Department of Neuroscience, Neurosurgery, Uppsala University, Uppsala, Sweden;
6. Institution of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden