1. Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston
2. Brigham and Women’s Hospital Heart & Vascular Center, Harvard Medical School, Boston, Massachusetts
3. Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas
4. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston
5. Division of Cardiology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois
6. Division of Cardiology, Ronald Reagan UCLA Medical Center, Los Angeles, California