Affiliation: | 1. Division of Gastroenterology, Department of Internal Medicine, Graduate School of Medicine, Kobe University, Kobe, Japan;2. Department of Endoscopy, Kobe University Hospital, Kobe, Japan;3. Digestive Disease Center, Showa University Koto‐Toyosu Hospital, Tokyo, Japan;4. Gastrointestinal Diseases Research Unit, Queens University, Kingston, Canada |