1 Department of Gastroenterology, Digestive Endoscopy Unit, Humanitas Research Hospital - IRCCS, Rozzano, Milano, Italy.
2 Department of Gastroenterology, Digestive Endoscopy Unit, Humanitas Research Hospital - IRCCS, Rozzano; Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milano, Italy.
3 Department of Pathology, Humanitas Research Hospital - IRCCS, Rozzano, Milano, Italy.