1. Department of Medicine University of California San Diego CA USA
2. Department of Medicine VA San Diego Healthcare System San Diego CA USA
3. Department of Epidemiology and Biostatistics University of California San Francisco CA USA
4. Icelandic Heart Association Research Institute Kopavogur Iceland
5. Department of Family Medicine and Public Health University of California San Diego CA USA
6. Faculty of Medicine University of Iceland Reykjavik Iceland
7. Department of Radiology & Biomedical Imaging University of California San Francisco CA USA
8. National Institute on Aging Bethesda MD USA
9. Maine Medical Center Research Institute Scarborough ME USA
10. Department of Biomedical Engineering Program of Advanced Musculoskeletal Imaging (PAMI), Cleveland Clinic Cleveland OH USA