1. Research Unit of Clinical Medicine, University of Oulu, Oulu, Finland
2. Department of Economics, Accounting and Finance, University of Oulu, Oulu, Finland
3. Research Unit of Population Health, University of Oulu, Oulu, Finland
4. Clinic of Child Psychiatry, Oulu University Hospital, Oulu, Finland
5. Department of Psychiatry, Oulu University Hospital, Oulu, Finland