Mario D'Amico1, Francesca Pasta2. 1. Department of Biopathology and Medical and Forensic Biotechnologies, University of Palermo, Piazza delle Cliniche, 90127 Palermo, Italy; Biomedical Department of Internal and Specialist Medicine, University of Palermo, Piazza delle Cliniche, 90127 Palermo, Italy. Electronic address: damicoma@gmail.com. 2. Department of Medicine, University of Palermo, Villa Sofia-Cervello Hospital, Via Trabucco 180, 90146 Palermo, Italy. Electronic address: francescapa88@yahoo.it.