1. Department of Gastroenterology, Endoscopy division, National Cancer Center Hospital East, Kashiwa, Japan
2. Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan
3. Department of Therapeutic Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
4. Innovative Clinical Research Center (iCREK), Kanazawa University Hospital, Japan
5. Department of Biostatistics, Kyoto Prefectural University of Medicine Graduate School of Medical Science, Japan
6. Department of Gastrointestinal Oncology, Hyogo Cancer Center, Hyogo, Japan
7. Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
8. Endoscopy Division, Shizuoka Cancer Center, Shizuoka, Japan
9. Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Disieses, Osaka, Japan
10. Department of Gastroenterology and Hepatology, Nagasaki University Hospital, Nagasaki, Japan