1. Institute for Technology Assessment, Massachusetts General Hospital, Boston
2. Department of Radiology, Harvard Medical School, Boston, Massachusetts
3. Cardiovascular Research Center, Massachusetts General Hospital, Boston
4. Demoulas Center for Cardiac Arrhythmias, Massachusetts General Hospital, Boston
5. Division of General Internal Medicine, Massachusetts General Hospital, Boston
6. Department of Medicine, Harvard Medical School, Boston, Massachusetts
7. Department of Medicine, University of Massachusetts Chan Medical School, Worcester