1. Departments of Psychology
2. National Institute for Health and Welfare, Helsinki, Finland
3. Hospital for Children and Adolescents, Helsinki University Central Hospital, Helsinki, Finland
4. Institute of Health Sciences/Geriatrics, University of Oulu, Oulu, Finland
5. Unit of General Practice, Oulu University Hospital, Oulu, Finland
6. National Public Health Institute, Helsinki, Finland
7. Physiology, University of Helsinki, Helsinki, Finland