1. Texas Cardiac Arrhythmia Institute; St. David's Medical Center; Austin Texas USA
2. Albert Einstein College of Medicine at Montefiore Hospital; Bronx, New York USA
3. Department of Biomedical Engineering; University of Texas; Austin Texas USA
4. Department of Cardiology; University of Foggia; Foggia Italy
5. Division of Cardiology; Stanford University; Palo Alto California USA