1. Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas
2. Department of Medicine, University of Mississippi Medical Center, Jackson
3. Division of Cardiology, Department of Internal Medicine, Wake Forest University, Winston-Salem, North Carolina
4. Division of Cardiology, Duke Clinical Research Institute, Durham, North Carolina
5. Inova Heart and Vascular Institute, Falls Church, Virginia
6. Division of Nephrology, University of Maryland School of Medicine, Baltimore
7. Section of Cardiology and Cardiovascular Research, Department of Medicine, Baylor College of Medicine, Houston, Texas