Giuseppe Boriani1, Igor Diemberger2. 1. Cardiology Division. Department of Diagnostics, Clinical and Public Health Medicine, University of Modena and Reggio Emilia, Policlinico di Modena, Modena, Italy. 2. Institute of Cardiology, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Policlinico S. Orsola-Malpighi, Bologna, Italy.