1. Digestive Endoscopy Unit, Catholic University, Gemelli University Hospital, Rome, Italy
2. Surgical Department, Campus Bio Medico University Hospital, Rome, Italy
3. Department of Geriatrics, Catholic University, Gemelli University Hospital, Rome, Italy
4. Hepatology Unit, National Institute for Infectious Diseases, L. Spallanzani Hospital, Rome, Italy
5. General Surgery and Transplantation Unit, San Camillo Hospital, Rome, Italy