1. Cardiology Division, Department of Medicine, Harvard Medical School, Massachusetts General Hospital, Boston
2. Baim Institute for Clinical Research, Boston, Massachusetts
3. Division of Cardiovascular Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
4. Cardiovascular Division, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee
5. Nephrology Division, Department of Medicine, Harvard Medical School, Massachusetts General Hospital, Boston