1. Service Centre of Kuusanmäki, Finland
2. Medical Faculty, University of Oulu, Finland
3. Department of Teacher Education, University of Oulu, Kajaani, Finland
4. Unit of General Practice, University Hospital of Oulu, Finland
5. Institute of Health Sciences, University of Oulu, Finland
6. Rinnekoti Research Centre, Espoo, Finland
7. Department of Child Neurology, University of Helsinki, Finland