1. Department of General Surgery, Ospedale Luigi Sacco, Università degli Studi di Milano, 20157 Milan, Italy
2. School of Medicine and Surgery, University of Milano-Bicocca, 20126 Milan, Italy
3. Emergency Department, ASST Grande Ospedale Metropolitano Niguarda, 20162 Milan, Italy
4. Department of Gastroenterology, ASST Ovest Milanese, 20025 Legnano, Italy
5. Endoscopy Division, Ospedale San Leopoldo Mandic di Merate, ASST Lecco, 23807 Lecco, Italy
6. Department of Biomedical and Clinical Sciences “L. Sacco”, Università degli Studi di Milano, 20157 Milan, Italy