1. Department of Psychiatry, University of Kuopio, Finland
2. Research Institute of Public Health, University of Kuopio, Finland
3. Department of Public Health and General Practice, University of Kuopio, Finland
4. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI
5. Institute for Social Research, University of Michigan, Ann Arbor, MI
6. Inner Savo Health Centre, Suonenjoki, Finland