1. Division of Cardiology, University Hospital Paolo Giaccone, 90100 Palermo, Italy
2. Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE), University of Palermo, 90100 Palermo, Italy
3. Institute of Transplant and Highly Specialized Therapies (ISMETT) of Palermo, 90100 Palermo, Italy