1. Department of Clinical and Experimental Medicine, Cardiology Unit, University of Messina, 98100 Messina, Italy
2. Department of Biomedical and Dental Sciences and Morphological and Functional Imaging, University of Messina, 98100 Messina, Italy
3. Istituto di Fisiologia Clinica, Clinical Physiology Institute, CNR, 56124 Pisa, Italy
4. Cardiology Unit, Heart Centre, Fondazione Gabriele Monasterio—Regione Toscana, 54100 Massa, Italy