1. Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Chiba Japan
2. JCOG Data Center/Operations Office National Cancer Center Hospital Tokyo Japan
3. Hasuike Clinic Hyogo Japan
4. Division of Endoscopy Shizuoka Cancer Center Shizuoka Japan
5. Department of Gastrointestinal Medical Oncology National Cancer Center Hospital Tokyo Japan
6. Department of Oncology and General Medicine, IMSUT Hospital Institute of Medical Science, The University of Tokyo Tokyo Japan
7. Endoscopy Division National Cancer Center Hospital Tokyo Japan
8. Department of Endoscopy Saku Central Hospital Advanced Care Center Nagano Japan
9. Department of Gastroenterology, Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo Japan
10. Division of Endoscopy Yokohama City University Medical Center Kanagawa Japan
11. Clinical Trial Promotion Department Chiba Cancer Center Chiba Japan
12. Department of Endoscopy Koyukai Shin‐Sapporo Hospital Hokkaido Japan
13. Department of Therapeutic Oncology Kyoto University Graduate School of Medicine Kyoto Japan