1 Department of Biomedical Sciences and Public Health, Cardiology and Arrhythmology Clinic, Marche Polytechnic University, University Hospital 'Ospedali Riuniti', Via Conca 71, Ancona, Italy.
2 Department of Cardiovascular, Respiratory, Nephrology, Anesthesiology and Geriatric Sciences, 'Sapienza' University of Rome, Policlinico Umberto I, Viale del Policlinico 155, Rome, Italy.