1. Department of Endoscopy; The Jikei University School of Medicine; Tokyo Japan
2. Department of Gastroenterology; Toranomon Hospital; Tokyo Japan
3. Department of Gastroenterology; Cancer Institute Ariake Hospital; Tokyo Japan
4. Department of Gastroenterology; Takeda General Hospital; Kyoto Japan
5. Division of Endoscopy; Shizuoka Cancer Center; Shizuoka Japan
6. Department of Gastroenterology; Kobe University; Kobe Japan
7. Department of Gastroenterology; Ishikawa Prefectural Central Hospital; Ishikawa Japan
8. Department of Gastroenterology and Hepatology; Tokyo Medical University Hospital; Tokyo Japan
9. Department of Medicine and Clinical Science; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
10. Department of Surgery; Kyorin University School of Medicine; Tokyo Japan