1 Endoscopy Service, Department of Diagnostic and Therapeutic Services, IRCCS-ISMETT (Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione), Palermo, Italy.
2 Section of Gastroenterology, Biomedical Department of Internal and Specialized Medicine (DI.BI.M.I.S.), University of Palermo, Palermo, Italy.
3 Radiology Unit, Department of Diagnostic and Therapeutic Services, IRCCS-ISMETT (Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione), Palermo, Italy.