1. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
2. Endoscopy Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
3. Hepatogastroenterology Unit, 2nd Department of Propaedeutic Internal Medicine, Medical School, National and Kapodistrian University of Athens, Attikon University General Hospital, Athens, Greece