1. Department of Radiology, Landspitali University Hospital, Reykjavík, Iceland
2. Department of Radiology, Domus Medica, Reykjavík, Iceland
3. Icelandic Heart Association, Kopavogur, Iceland
4. Faculty of Medicine, University of Iceland, Reykjavík, Iceland
5. National Institute on Aging (NIA), National Institutes of Health (NIH), Bethesda, MD, USA
6. Department of Rheumatology, Landspitali University Hospital, Reykjavík, Iceland