1. Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
2. Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
3. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA.
4. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
5. Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, Minnesota, USA.
6. National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA.
7. Division of Preventive Medicine, University of Alabama at Birmingham School of Public Health, Birmingham, Alabama, USA.
8. Division of Research, Kaiser-Permanente, Oakland, California, USA.
9. Division of Cardiovascular Research, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.