1. Texas Cardiac Arrhythmia Institute; St. David's Medical Center; Austin Texas USA
2. Department of Internal Medicine; Dell Medical School; Austin Texas USA
3. California Pacific Medical Center; San Francisco California USA
4. Albert Einstein College of Medicine at Montefiore Hospital; New York USA
5. University of Pennsylvania; Pennsylvania USA
6. Univ Tor Vergata; Rome Italy
7. Catholic University; Rome Italy
8. Ospedale dell' Angelo; Mestre /Venice Italy
9. RCCS Monzino Hospital; Milan Italy