1. Department of Pediatric Neurology, Turku University Hospital and University of Turku, Finland
2. Department of Clinical Medicine, Turku University Hospital and University of Turku, Finland
3. Department of Biostatistics, Turku University Hospital and University of Turku, Finland
4. Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
5. Department of Clinical Neurosciences, Turku University Hospital and University of Turku, Finland