1. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
2. Endoscopy Unit, Humanitas Clinical and Research Center – IRCCS, Rozzano, Italy
3. Gastroenterology Department, Valduce Hospital, Como, Italy
4. Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway
5. Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan