1. Department of Public Health, University of Turku, Turku
2. Petrea, Rehabilitation Center, Turku
3. Department of Physical and Rehabilitation Medicine, Turku University Central Hospital, Turku
4. Department of Child Neurology, Helsinki University Central Hospital, Helsinki
5. Department of Child Neurology, Turku University Central Hospital, Turku
6. Department of Biostatistics, University of Turku, Turku
7. Department of Physical and Rehabilitation Medicine, The Rheumatism Foundation Hospital, Heinola
8. Child and Adolescent Health Care Unit, Turku City Hospital, Turku
9. Institute of Dentistry, University of Turku, Turku, Finland