1. Division of Gastroenterology; Showa University Fujigaoka Hospital; Yokohama Japan
2. Department of Gastrointestinal Oncology; Osaka International Cancer Institute; Osaka Japan
3. Department of Surgery; Kyorin University School of Medicine; Tokyo Japan
4. Faculty of Medicine; Department of Gastroenterology and Neurology; Kagawa University; Kagawa Japan
5. Digestive Disease Center; Showa University Koto Toyosu Hospital; Tokyo Japan
6. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine; Dentistry, and Pharmaceutical Sciences; Okayama Japan
7. Endoscopy Department; Yokohama City University Medical Center; Yokohama Japan
8. Department of Gastroenterology; Ishikawa Prefectural Central Hospital; Kanazawa Japan
9. Division of Research and Development for Minimally Invasive Treatment; Cancer Center; Keio University School of Medicine; Tokyo Japan
10. Department of Gastroenterology; Kobe City Medical Center General Hospital; Hyogo Japan
11. Endoscopy Center and Endoscopy Research Institute; Zhongshan Hospital; Fudan University; Shanghai China