1. Azienda Ospedaliera Universitaria Policlinico “Gaetano Martino”, Department of Clinical and Experimental MedicineUniversity of Messina Messina Italy
2. Division of Clinical Cardiology, A.O.R.N. Sant'Anna e San Sebastiano, Caserta, Italy; Department of Cardiothoracic and Respiratory SciencesUniversity of Campania "Luigi Vanvitelli" Naples Italy
3. Department of CardiologyBern University Hospital, University of Bern Bern Switzerland