1. Department of Social Medicine, CAPHRI School for Public Health and Primary Care; Maastricht University; Maastricht The Netherlands
2. Laboratory of Epidemiology and Population Sciences; National Institute on Aging; Bethesda Maryland USA
3. The Icelandic Heart Association; Kopavogur Iceland
4. Faculty of Medicine; University of Iceland; Reykjavik Iceland
5. Department of Radiology and Biomedical Imaging; University of California; San Francisco California USA.