1. The Icelandic Gerontological Research Institute Reykjavik Iceland
2. Faculty of Food Science and Nutrition University of Iceland Reykjavik Iceland
3. School of Health Sciences University of Iceland Reykjavik Iceland
4. Faculty of Nursing University of Iceland Reykjavik Iceland
5. Laboratory of Epidemiology and Population Sciences, Intramural Research Program National Institute on Aging Baltimore MD USA
6. Division of Epidemiology and Clinical Applications, National Eye Institute National Institutes of Health Bethesda MD USA
7. Icelandic Heart Association Research Institute Kopavogur Iceland
8. Faculty of Medicine, University of Iceland, University of Iceland Reykjavik Iceland