Francesco Paolo Prete1, Roberto Ria2, Angela Gurrado3, Mario Testini3. 1. Academic Unit of General Surgery, Department of Biomedical Sciences and Human Oncology, University of Bari "Aldo Moro" Medical School, Bari, Italy. Electronic address: pretef@gmail.com. 2. Operative Unit of Internal Medicine "G. Baccelli," Department of Biomedical Sciences and Human Oncology, University of Bari "Aldo Moro" Medical School, Bari, (BA), Italy. 3. Academic Unit of General Surgery, Department of Biomedical Sciences and Human Oncology, University of Bari "Aldo Moro" Medical School, Bari, (BA), Italy.