Katri Laimi1, Johanna Pitkänen2, Liisa Metsähonkala3, Tero Vahlberg4, Marja Mikkelsson5, Minna Erkintalo6, Minna Aromaa7, Päivi Rautava8, Pirjo Anttila9, Airi Oksanen2, Mikhail Saltychev2, Matti Sillanpää10. 1. Department of Physical and Rehabilitation Medicine, Turku University Hospital and University of Turku, Finland Department of Public Health, University of Turku, Finland katri.laimi@tyks.fi. 2. Department of Physical and Rehabilitation Medicine, Turku University Hospital and University of Turku, Finland. 3. Department of Child Neurology, Turku University Hospital, Finland Department of Child Neurology, Helsinki University Hospital, Finland. 4. Department of Biostatistics, University of Turku, Finland. 5. Rehabilitation Centre, Päijät-Häme Central Hospital, Finland Department of Radiology, Turku University Hospital, Finland. 6. Child and Adolescent Health Care Unit, Turku City Hospital, Finland. 7. Department of Public Health, University of Turku, Finland Turku Clinical Research Centre, Turku University Hospital, Finland. 8. Department of Public Health, University of Turku, Finland Department of Pediatrics, Turku University Hospital, Finland. 9. School of Medicine, University of Tampere, Finland. 10. Department of Public Health, University of Turku, Finland Department of Child Neurology, Turku University Hospital, Finland.