1. St. David's Medical Center; Texas Cardiac Arrhythmia Institute; Austin TX USA
2. University of Texas at Austin; Austin TX USA
3. Electrophysiology and Arrhythmia Services; California Pacific Medical Center; San Francisco CA USA
4. Albert Einstein College of Medicine at Montefiore Hospital; Bronx New York USA
5. Metro Health Medical Center; Case Western Reserve University School of Medicine; Cleveland OH USA
6. Division of Cardiology; Stanford University; Stanford CA USA