1. PEDEGO Research Unit; University of Oulu; Oulu Finland
2. Department of Children and Adolescents; Division of Pediatric Neurology; Oulu University Hospital; Oulu Finland
3. Department of Ophthalmology; Oulu University Hospital; Oulu Finland
4. Medical Research Center Oulu; University of Oulu; Oulu Finland
5. Department of Clinical Genetics; Oulu University Hospital; Oulu Finland
6. Institute of Clinical Medicine - Neurology; University of Eastern Finland; Kuopio Finland
7. Department of Neurology; Kuopio University Hospital; Kuopio Finland
8. Research Unit of Clinical Neuroscience and Medical Research Center Oulu; University of Oulu; Oulu Finland
9. Department of Neurology; Oulu University Hospital; Oulu Finland