1. Gastroenterology Unit, Departmental Faculty of Medicine and Surgery, Università Campus Bio-Medico di Roma, Rome, Italy
2. Institute of Biochemistry and Cell Biology (IBBC), National Research Council (CNR), Monterotondo Scalo, Rome, Italy
3. Microscopic and Ultrastructural Anatomy Unit, Università Campus Bio-Medico di Roma, Rome, Italy
4. Predictive Molecular Diagnostic Division, Department of Pathology, Campus Bio-Medico University Hospital, Rome, Italy