1. Internal Medicine Unit; Gemona del Friuli Hospital; Gemona del Friuli Italy
2. Cardiology Unit, Department of Cardiopulmonary Sciences; Azienda Ospedaliero-Universitaria S Maria della Misericordia; Udine Italy
3. IRCAB Foundation; Udine Italy
4. Unit of Biostatistics, Epidemiology and Public Health, Department of Cardiac, Thoracic, and Vascular Sciences; University of Padova; Padova Italy