1. Department of Public Health; University of Helsinki; Finland
2. Department of Adolescent Psychiatry; Helsinki University Central Hospital; Helsinki Finland
3. Institute of Clinical Medicine, Child Psychiatry; University of Turku; Finland
4. Department of Mental Health and Substance Abuse Services; National Institute for Health and Welfare; Helsinki Finland
5. Department of Adolescent Psychiatry; The Hospital District of Helsinki and Uusimaa; Hyvinkää Finland
6. Finnish Student Health Service; Helsinki Finland