1. Division of Cardiology, Duke University School of Medicine , Durham, North Carolina 27708 , USA
2. Duke Clinical Research Institute , Durham, North Carolina 27701 , USA
3. Saw Swee Hock School of Public Health, National University of Singapore & the National University Health System , Singapore
4. Department of Cardiology, University Medical Center Groningen , Groningen , The Netherlands
5. Duke-National University of Singapore Medical School , Singapore
6. Division of Cardiology, Northwestern University Feinberg School of Medicine , Chicago, IL , USA
7. National Heart Centre Singapore , Singapore
8. Division of Cardiology, Massachusetts General Hospital , Boston, Massachusetts , USA
9. Department of Cardiovascular Medicine, Mayo Clinic , Rochester, Minnesota , USA
10. Division of Cardiology, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
11. Division of Cardiology, University of Texas Southwestern Medical Center , Dallas, Texas , USA
12. Cardiovascular Medicine, Sarver Heart Center, University of Arizona , Tucson, Arizona , USA
13. Section on Cardiovascular Medicine, Department of Internal Medicine, Wake Forest School of Medicine , Winston-Salem, North Carolina , USA
14. Sections on Geriatrics, Department of Internal Medicine, Wake Forest School of Medicine , Winston-Salem, North Carolina , USA