1. Department of Neuroscience, Neurology, Uppsala University Hospital, Uppsala University, Uppsala, Sweden
2. Department of Pharmacology and Clinical Neuroscience, Neurology, Östersund, Umeå University, Umeå, Sweden
3. Department of Medical Radiation Physics, Lund University, Lund, Sweden
4. Department of Neuroscience, Neurosurgery, Uppsala University, Uppsala, Sweden
5. Department of Radiology, Uppsala University, Uppsala, Sweden