1. Department of Psychiatry and Narcology, Faculty of Medicine, Riga Stradins University, Riga, Latvia
2. Child and Youth Mental Health Centre, Children’s Clinical University Hospital, Riga, Latvia
3. Department of Mathematics, Faculty of Physics, Mathematics and Optometry, University of Latvia, Riga, Latvia
4. Department of Public Health and Epidemiology, Faculty of Public Health and Social Welfare, Riga Stradins University, Riga, Latvia