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