1. Vanderbilt Heart and Vascular Institute; Vanderbilt University Medical Center; Nashville Tennessee
2. Vanderbilt University Medical School; Nashville Tennessee
3. Henry Ford Hospital Detroit; Detroit Michigan
4. University of Michigan/Cardiovascular Center; Ann Arbor Michigan
5. Thomas Jefferson University; Philadelphia Pennsylvania
6. Cooper Health System; Camden New Jersey
7. North Ohio Heart Center; Elyria Ohio
8. Cardiac Electrophysiology Laboratory; Philadelphia Pennsylvania