1. Section of Cardiology, Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, 98122 Messina, Italy
2. Department of Clinical and Experimental Medicine, Policlinic University Hospital of Messina, 98122 Messina, Italy
3. Internal Medicine Unit, Department of Clinical and Experimental Medicine, University of Catania, 95125 Catania, Italy
4. Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
5. Cardiothoracic Department, Policlinico Riuniti University Hospital, 71100 Foggia, Italy