1. Texas Cardiac Arrhythmia Institute; St. David's Medical Center; Austin Texas USA
2. Department of Heart and Vessels; University of Florence; Florence Italy
3. Hospital of the University of Pennsylvania; Pennsylvania USA
4. Beijing Anzhen Hospital; Capital Medical University; Beijing China
5. University of Milan; Milan Italy
6. University of Foggia; Foggia Italy
7. Albert Einstein College of Medicine at Montefiore Hospital; New York USA
8. Department of Internal Medicine; Dell Medical School; Austin Texas USA
9. California Pacific Medical Center; San Francisco California USA
10. Interventional Electrophysiology; Scripps Clinic; San Diego California USA
11. Division of Cardiology; Stanford University; Palo Alto California USA