1. Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland
2. MRC, Oulu University Hospital, Oulu, Finland
3. Institute of Clinical Medicine, Neurology, University of Eastern Finland, Kuopio, Finland
4. Department of Neurology, Lapland Central Hospital, Rovaniemi, Finland
5. Neuro Center, Neurology, Kuopio University Hospital, Kuopio, Finland
6. A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
7. Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland