1. Department of Ophthalmology Central Hospital of Central Finland Jyväskylä Finland
2. Gerontology Research Center and Faculty of Sport and Health Sciences University of Jyvaskyla Jyväskylä Finland
3. Department of Public Health University of Southern Denmark Odense Denmark
4. Department of Public Health University of Helsinki Helsinki Finland
5. Institute for Molecular Medicine FIMM University of Helsinki Helsinki Finland
6. Department of Health National Institute for Health and Welfare Helsinki Finland