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