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