1. Department of Pediatric Neurology, University of Turku, 20014 Turku, Finland
2. Salo Health Centre, 24240 Salo, Finland
3. Department of General Practice, Institute of Clinical Medicine, Turku University Hospital, University of Turku, 20014 Turku, Finland
4. Public Health, Turku Clinical Research Centre, Turku University Hospital, University of Turku, 20014 Turku, Finland
5. Department of Pediatrics, Turku University Hospital, University of Turku, 20014 Turku, Finland