1. Clinical Trials Center, Cardiovascular Research Foundation; New York New York
2. Division of Cardiology, Columbia University Medical Center; New York New York
3. Brüderkrankenhaus; Trier Germany
4. Division of Cardiology; Cardiovascular Department; Ospedale Papa Giovanni XXIII; Bergamo Italy
5. Department of Cardiology; VU University Medical Center; Amsterdam the Netherlands
6. Policlinico Casilino; Rome Italy
7. Department of Interventional Cardiology; San Giovanni Hospital; Rome Italy