1 Department of Thoracic Surgery, National Cancer Center Hospital East, Chiba, Japan; Present address: Division of Thoracic Surgery, Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582 Japan. Electronic address: thishida@nifty.com.
2 Department of Thoracic Surgery, National Cancer Center Hospital East, Chiba, Japan.
3 Department of Surgery, University Hospital Mizonokuchi, Teikyo University School of Medicine, Kanagawa, Japan.
4 Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan.
5 Division of Gastroenterology Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan.
6 Clinical Research Support Center, Shizuoka Cancer Center, Shizuoka, Japan.
7 General Thoracic Surgery, Kyorin University School of Medicine, Tokyo, Japan.