1. Helmsley Electrophysiology Center Icahn School of Medicine at Mount Sinai New York New York
2. Sentara Cardiovascular Research Institute Norfolk Virginia
3. University of Alabama at Birmingham Birmingham Alabama
4. Pacific Heart Institute Santa Monica California
5. University of California San Francisco School of Medicine San Francisco California
6. Texas Cardiac Arrhythmia Institute Austin Texas USA
7. William Beaumont Hospital Royal Oak Michigan
8. The Methodist Hospital Houston Texas
9. University of Virginia Charlottesville Virginia
10. Massachusetts General Hospital Boston Massachusetts