1 Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy; Endoscopy Unit, Humanitas Clinical and Research Hospital, IRCCS, Rozzano, Italy. Electronic address: cesareh@hotmail.com.
2 Division of Gastroenterology, VA Medical Center, University of Kansas School of Medicine, Kansas City, Kansas.
3 Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway; Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan.
4 Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway.
5 Division of Gastroenterology/Hepatology, Indiana University School of Medicine, Indianapolis, Indiana.
6 Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy; Endoscopy Unit, Humanitas Clinical and Research Hospital, IRCCS, Rozzano, Italy.