1. Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya, Japan
2. Department of Surgery, Institute of Gastroenterology, Tokyo Women’s Medical University, Tokyo, Japan
3. Department of Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
4. Department of Gastroenterology, Tsuchiura Kyodo General Hospital, Tsuchiura, Japan
5. Department of Gastroenterological surgery, Ishikawa Prefectural Central Hospital, Kanazawa, Japan
6. Division of Gastroenterology, Chiba Cancer Center, Chiba, Japan
7. Department of Biostatistics and Epidemiology, Yokohama City University School of Medicine, Yokohama, Japan
8. Department Integrated Science and Engineering for Sustainable Society, Chuo University, Tokyo, Japan
9. Tokyo Medical and Dental University, Tokyo, Japan