1 Division of Cardiology, Azienda Ospedaliero-Universitaria Policlinico "G. Rodolico - San Marco", University of Catania, Catania, Italy.
2 Division of Cardiology, Azienda Ospedaliero-Universitaria Policlinico "G. Rodolico - San Marco", University of Catania, Catania, Italy. Electronic address: dcapodanno@unict.it.