1. Department of Ophthalmology; Central Hospital of Central Finland; Jyväskylä Finland
2. Gerontology Research Center and Department of Health Sciences; University of Jyväskylä; Jyväskylä Finland
3. Department of Public Health; University of Helsinki; Helsinki Finland
4. Institute for Molecular Medicine; University of Helsinki; Helsinki Finland
5. Department of Health; National Institute for Health and Welfare; Helsinki Finland