1Cancer Institute Hospital of the Japanese Foundation for Cancer Research, Tokyo, Japan
2Department of Surgery, Niigata Prefectural Cancer Center Niigata Hospital, Niigata, Japan
3Department of Surgery, Osaka General Medical Center, Osaka, Japan
4Department of Surgery, Kobe City Medical Center General Hospital, Kobe, Japan
5Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan
6Department of Surgical Oncology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, 501-1194 Japan
7Department of Gastrointestinal Surgery, Kanagawa Cancer Center, Yokohama, Japan
8Research Center for Innovative Oncology, National Cancer Center Hospital East, Chiba, Japan
9Kyoto University Graduate School of Medicine, Kyoto, Japan
10Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, Nagoya, Japan
11Division of Gastrointestinal Surgery, Department of Surgery, Graduate School of Medicine, Kobe University, Kobe, Japan
12Japanese Foundation for Multidisciplinary Treatment of Cancer, Tokyo, Japan