1. Department of Radiology, Landspitali—The National University Hospital of Iceland, Hringbraut, 101 Reykjavik, Iceland
2. Icelandic Heart Association, Holtasmari 1, 201 Kopavogur, Iceland
3. Faculty of Medicine, School of Health Sciences, University of Iceland, Vatnsmyrarvegur 16, Reykjavik, Iceland
4. Department of Internal Medicine II, Regensburg University Hospital, Franz-Josef-Strauss-Allee 11, Regensburg, Germany
5. Laboratory of Epidemiology and Population Sciences, National Institute of Ageing, National Institutes of Health, 7201 Gateway Building, Bethesda, MD, USA
6. Department of Cardiology, Landspitali - The National University Hospital of Iceland, Hringbraut, Reykjavik, Iceland