1. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas
2. Brigham and Women’s Hospital Heart and Vascular Center, Harvard Medical School, Boston, Massachusetts
3. Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas
4. Ahmanson-UCLA Cardiomyopathy Center, University of California, Los Angeles, Los Angeles
5. Department of Medicine, University of Mississippi Medical Center, Jackson