1. Texas Cardiac Arrhythmia Institute, St. David’s Medical Center, 3000 N. I-35, Suite 720, Austin, TX, USA
2. Department of Internal Medicine, Dell Medical School, University of Texas, Austin, TX, USA
3. University of Milan, Milan, Italy
4. Texas A & M College of Medicine, Bryan, TX, USA
5. Division of Cardiology, Stanford University, Palo Alto, CA, USA
6. Case Western Reserve University, Cleveland, OH, USA
7. Interventional Electrophysiology, Scripps Clinic, San Diego, CA, USA