1 Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-Ku, Tokyo, 160-8582, Japan. kitagawa@a3.keio.jp.
2 Department of Gastrointestinal Oncology, Osaka International Cancer Institute, Osaka, Japan.
3 QST Hospital, National Institutes for Quantum Science and Technology, Chiba, Japan.
4 Department of Radiation Oncology, Showa University School of Medicine, Tokyo, Japan.
5 Department of Hepato-Biliary-Pancreatic and Gastrointestinal Surgery, International University of Health and Welfare School of Medicine, Chiba, Japan.
6 Department of Endoscopy, Saku Central Hospital Advanced Care Center, Nagano, Japan.
7 Department Head and Neck, Esophageal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan.
8 Kiryu Kosei General Hospital, Gunma, Japan.
9 Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-Ku, Tokyo, 160-8582, Japan.
10 Department of Pathology, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan.
11 Department of Gastroenterology and Hepatology, Gunma University Graduate School of Medicine, Gunma, Japan.
12 Department of Gastrointestinal Tract Surgery, Fukushima Medical University, Fukushima, Japan.
13 Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Chiba, Japan.
14 Department of Surgery, Hamamatsu University School of Medicine, Shizuoka, Japan.
15 Division of Gastrointestinal Oncology, Shizuoka Cancer Center, Shizuoka, Japan.
16 National Hospital Organization Kyushu Cancer Center, Fukuoka, Japan.
17 Department of Radiology, Yamagata University Graduate School of Medicine, Yamagata, Japan.
18 Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan.
19 Department of Frontier Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan.
20 Department of Central Laboratory and Surgical Pathology, National Hospital Organization Osaka National Hospital, Osaka, Japan.
21 Clinical Trial Promotion Department, Chiba Cancer Center, Chiba, Japan.
22 Department of Surgery, Japanese Red Cross Maebashi Hospital, Gunma, Japan.
23 Department of Clinical Oncology, Kyoto University Hospital, Kyoto, Japan.
24 Division of Epidemiology, National Cancer Center Institute for Cancer Control, Tokyo, Japan.
25 Department of General Surgery, Kawasaki Medical School, Okayama, Japan.
26 Department of Hepato-Biliary-Pancreatic and Gastrointestinal Surgery, School of Medicine, International University of Health and Welfare Ichikawa Hospital, Chiba, Japan.