[1] Univ Iceland, Unit Nutr Res, Reykjavik, Iceland
[2] Landspitali, Unit Nutr Res, Reykjavik, Iceland
[3] Univ Iceland, Fac Food Sci & Nutr, Sch Hlth Sci, Reykjavik, Iceland
[4] Iceland Heart Assoc, Kopavogur, Iceland
[5] NEI, Div Epidemiol & Clin Applicat, Bethesda, MD 20892 USA
[6] NIA, Lab Epidemiol & Populat Sci, Bethesda, MD 20892 USA