1. Endoscopy Service, Department of Diagnostic and Therapeutic Services, IRCCS–ISMETT, Via Tricomi 5, Palermo, Italy
2. Endoscopy Service, Department of Diagnostic and Therapeutic Services, IRCCS–ISMETT, Palermo, Italy
3. Pathology Service, Department of Diagnostic and Therapeutic Services, IRCCS–ISMETT, Palermo, Italy