1. Gastroenterology Unit, Hospital of Imola, University of Bologna , Imola, Italy
2. Department of Medicine, Gastroenterology and Digestive Endoscopy Unit, The Pancreas Institute, University Hospital of Verona , Verona, Italy
3. Gastrointestinal Endoscopy Unit, Humanitas—Mater Domini Castellanza , Varese, Italy
4. Gastroenterology and Hepatology, Stanford University , Stanford, CA, USA
5. Department of Medical Oncology, IRCSS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori” , Medola, Italy
6. Department of Medical and Surgical Sciences—DIMEC, University of Bologna , Bologna, Italy
7. Department of Surgical and Medical Sciences, Section of Gastroenterology, University of Foggia , Foggia, Italy