1. Department of Gastroenterology; Toyoshima Endoscopy Clinic; Tokyo Japan
2. The Institute for Adult Diseases; Asahi Life Foundation; Tokyo Japan
3. Department of Gastroenterology; Tokyo Medical Center; National Hospital Organization; Tokyo Japan
4. Department of Gastroenterology; Graduate School of Medicine; The University of Tokyo; Tokyo Japan
5. Department of Gastrointestinal Surgery; Graduate School of Medicine; The University of Tokyo; Tokyo Japan
6. Department of Gastroenterology; Kanto Central Hospital; Tokyo Japan
7. Department of Colorectal Surgery; Japanese Red Cross Medical Center; Tokyo Japan
8. Department of Pathology; PCL Japan; Tokyo Japan
9. Department of Gastroenterology; Toranomon Hospital; Tokyo Japan
10. Endoscopy Division; National Cancer Center Hospital; Tokyo Japan
11. Department of Gastroenterology; Cancer Institute Hospital; Tokyo Japan
12. Division of Research and Development for Minimally Invasive Treatment; Cancer Center; Keio University School of Medicine; Tokyo Japan