1. Department of Medicine, Division of Cardiology, Emory University of School of Medicine, 101 Woodruff Circle, Woodruff Memorial Building, Atlanta, GA 30322, USA
2. Department of Cardiovascular Sciences, East Carolina Heart Institute, Brody School of Medicine, East Carolina University, 115 Heart Drive, Greenville, NC 27834, USA
3. Department of Medicine, Division of Cardiology, University of Pennsylvania School of Medicine, 9 Founders Pavilion, 3400 Spruce Street, Philadelphia, PA 19104, USA
4. Department of Epidemiology, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, GA 30322, USA
5. Department of Medicine, Division of Cardiology, and The Ciccarone Center for the Prevention of Heart Disease, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287, USA
6. Department of Epidemiology, Bloomberg School of Public Health, John Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205, USA
7. Cardiovascular Health Research Unit and Department of Epidemiology, University of Washington, 1730 Minor Ave, Seattle, WA 98101, USA
8. Department of Internal Medicine, Section on Cardiology, Wake Forest School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, USA
9. Epidemiological Cardiology Research Center (EPICARE), Department of Epidemiology and Prevention, Wake Forest School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, USA