1. Clinique Pasteur, Toulouse, France
2. Division of Cardiology, C.A.S.T., Azienda Ospedaliero-Universitaria “Policlinico-Vittorio Emanuele”, University of Catania, Catania, Italy
3. Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
4. Columbia University Medical Center, New York-Presbyterian Hospital, Cardiovascular Research Foundation, New York, NY, USA