1 Gastroenterology and Digestive Endoscopy Unit, Department of Biochemical and Clinical Sciences 'L Sacco', University of Milan, ASST Fatebenefratelli Sacco, Milano, Italy cannatelli.rosanna@asst-fbf-sacco.it.
2 Gastroenterology and Digestive Endoscopy Unit, Department of Biochemical and Clinical Sciences 'L Sacco', University of Milan, ASST Fatebenefratelli Sacco, Milano, Italy.