1. Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences Niigata University Niigata Japan
2. Digestive Diseases Center Showa University Koto‐Toyosu Hospital Tokyo Japan
3. Department of Gastroenterology Kobe University Hospital Kobe Japan
4. Department of Gastroenterological Surgery Fukuoka University Faculty of Medicine Fukuoka Japan
5. Department of Gastroenterology and Hepatology Nagasaki University Hospital Nagasaki Japan
6. Division of Advanced Surgical Science and Technology Tohoku University School of Medicine Miyagi Japan
7. Department of Practical Gastrointestinal Endoscopy, Faculty of Medicine, Dentistry and Pharmaceutical Sciences Okayama University Okayama Japan
8. Department of Gastroenterology Osaka Metropolitan University Graduate School of Medicine Osaka Japan
9. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
10. Division of Gastroenterology, Department of Medicine Jichi Medical University Tochigi Japan
11. Department of Gastroenterology, Faculty of Medicine Oita University Oita Japan
12. Department of Endoscopy Fukushima Medical University Hospital Fukushima Japan
13. Department of Gastroenterology and Hematology Hirosaki University Graduate School of Medicine Aomori Japan
14. Division of Gastroenterology and Nephrology, Department of Multidisciplinary Internal Medicine Tottori University Faculty of Medicine Tottori Japan
15. Department of Health Sciences University of Yamanashi Yamanashi Japan