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