1. Department of Medicine University of Arkansas for Medical Sciences Little Rock AR USA
2. Department of Medicine Forrest General Hospital Hattiesburg MS USA
3. Division of Cardiology, Department of Medicine Duke University Durham NC USA
4. Department of Medicine West Virginia University Morgantown WV USA
5. Department of Cardiology Kaiser Permanente San Francisco Medical Center San Francisco CA USA
6. Division of Research Kaiser Permanente Northern California Oakland CA USA
7. Heart & Vascular Center Brigham and Women's Hospital, Harvard Medical School Boston MA USA
8. Duke Clinical Research Institute 2301 Erwin Road Durham NC 27705 USA
9. Division of Cardiology, Department of Medicine University Texas Southwestern, and Parkland Health and Hospital System Dallas TX USA