1. Department of Public Health; University of Helsinki; Helsinki Finland
2. Department of Psychiatry; University of North Carolina at Chapel Hill; Chapel Hill North Carolina
3. Department of Adolescent Psychiatry; Helsinki University Central Hospital; Helsinki Finland
4. Institute of Clinical Medicine, Child Psychiatry, University of Turku; Turku Finland
5. Department of Mental Health and Substance Abuse Services; National Institute for Health and Welfare; Helsinki Finland
6. Parnassia Psychiatric Institute; Hague The Netherlands
7. Department of Psychiatry; University Medical Center Groningen; Groningen The Netherlands
8. Department of Epidemiology; Mailman School of Public Health; Columbia University; New York New York
9. Institute for Molecular Medicine Finland FIMM, University of Helsinki; Helsinki Finland