1 Cardiovascular Department, Azienda Ospedaliero-Universitaria Policlinico "G. Rodolico - San Marco," University of Catania, Catania, Italy. Electronic address: [email protected].
2 Cardiovascular Department, Azienda Ospedaliero-Universitaria Policlinico "G. Rodolico - San Marco," University of Catania, Catania, Italy.