1. Hjelt Institute, Department of Public Health; University of Helsinki; Finland
2. Department of Psychiatry; University of Oulu and Oulu University Hospital; Oulu Finland
3. Institute of Health Sciences; University of Oulu; Oulu Finland
4. Medical Research Center Oulu; Oulu University Hospital and University of Oulu; Oulu Finland
5. Department of Adolescent Psychiatry; Helsinki University Central Hospital; Helsinki Finland
6. Institute of Clinical Medicine, Child Psychiatry; University of Turku; Turku Finland
7. Department of Mental Health and Substance Abuse Services; National Institute for Health and Welfare; Helsinki Finland