1. Texas Cardiac Arrhythmia Institute; St. David's Medical Center; Austin Texas
2. Texas Cardiac Arrhythmia Research Foundation; Austin Texas
3. Department of Natural Science; University of Texas; Austin Texas
4. University of Milan; Milan Italy
5. Department of Cardiology; Gülhane Military Academy of Medicine; Ankara Turkey
6. Albert Einstein College of Medicine; Montefiore Hospital; Bronx New York
7. California Pacific Medical Center; San Francisco California USA
8. Interventional Electrophysiology; Scripps Clinic; San Diego California USA
9. Department of Internal Medicine; Dell Medical School; Austin Texas USA
10. Division of Cardiology; Stanford University; Palo Alto California USA