1. Department of Neurology, Institute of Clinical Medicine, University of Eastern Finland, FIN-70211 Kuopio, Finland
2. Department of Neurology, Kuopio University Hospital, FIN-70211 Kuopio, Finland
3. Department of Ophthalmology, Institute of Clinical Medicine, University of Eastern Finland, FIN-70211 Kuopio, Finland
4. Department of Ophthalmology, Kuopio University Hospital, FIN-70211 Kuopio, Finland