1. Faculty of Humanities Child Language Research Center University of Oulu Oulu Finland
2. PEDEGO Research Unit and Medical Research Center Oulu University of Oulu Oulu Finland
3. Department of Child Neurology Oulu University Hospital Oulu Finland
4. Department of Neonatology Oulu University Hospital Oulu Finland
5. Logopedics, Faculty of Social Sciences University of Tampere Tampere Finland