1. Department of Radiation Oncology, Aichi Cancer Center Hospital, Chikusa-ku, Nagoya
2. Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, Chikusa-ku, Nagoya
3. Department of Clinical Oncology, Aichi Cancer Center Hospital, Chikusa-ku, Nagoya
4. Department of Endoscopy, Aichi Cancer Center Hospital, Chikusa-ku, Nagoya
5. Department of Radiology, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan