1. Department of Child Neurology; Turku University Hospital; Turku Finland
2. Division of Clinical Neurosciences; Turku University Hospital; Turku Finland
3. Turku PET Centre; Turku Finland
4. VSKK, TYKS-SAPA; Turku Finland
5. Department of Clinical Neurophysiology; Turku University Hospital; Turku Finland
6. Department of Neurology; University of Wisconsin School of Medicine and Public Health; Madison Wisconsin U.S.A
7. Department of Psychology; Abo Akademi University; Turku Finland
8. Department of Public Health; University of Turku; Turku Finland
9. Turku Teacher Training College; University of Turku; Turku Finland
10. Departments of Neurology, Pediatrics and Epidemiology and Public Health; Montefiore Medical Center; Albert Einstein College of Medicine; Bronx New York U.S.A