1. Department of Public Health; University of Turku; Turku Finland
2. Public Dental Health Care Clinic; City of Turku Welfare Division; Turku Finland
3. Department of Community Dentistry; University of Turku; Turku Finland
4. Department of Psychology; University of Turku; Turku Finland
5. Child and Adolescent Clinic; City of Turku Welfare Division; Turku Finland
6. Child Neurology; Turku University Hospital; Turku Finland
7. Nordic School of Public Health; Gothenburg Sweden
8. Turku Clinical Research Centre; Turku University Hospital; Turku Finland