1. Child Psychiatry, Oulu University Hospital, Oulu, Finland
2. Research Unit of Clinical Medicine, Child Psychiatry, University of Oulu, Oulu, Finland
3. Division of Psychology, VISE, Faculty of Education and Psychology, University of Oulu, Finland
4. Nuorten Ystavat, NGO, Oulu, Finland
5. Research Unit of Logopedics, University of Oulu, Finland
6. Research Unit of Population Health, University of Oulu, Finland
7. Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland