1. Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Helsinki, Finland
2. Information Services Department, THL Finnish Institute for Health and Welfare, Helsinki
3. Research Centre for Child Psychiatry, University of Turku, Turku, Finland
4. Department of Neurobiology, Karolinska Institute, Stockholm, Sweden
5. Department of Public Health Solutions, THL Finnish Institute for Health and Welfare, Helsinki and Oulu
6. PEDEGO Research Unit, MRC Oulu, Oulu University Hospital, University of Oulu, Oulu, Finland
7. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim
8. Children’s Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland