1) Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan
2) Department of Surgery, Jikei University School of Medicine, Tokyo, Japan
3) Department of Cargiovascular Surgery, Tokyo Women's Medical University, Tokyo, Japan
4) General Thoracic Surgery, International Medical Center, Saitama Medical University, Hidaka, Japan
5) Department of Surgery, Keio University School of Medicine, Tokyo, Japan
6) Department of Cardiovascular Surgery, National Defense Medical College, Tokorozawa, Japan
7) Department of Cargiovascular Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
8) Department of Pediatric Surgery, Graduate School of Medicine, Kagoshima University, Kagoshima, Japan
9) Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
10) Tohoku Kosei Nenkin Hospital, Sendai, Japan
11) Department of Cardiovascular Surgery, Graduate School of Medical Sciences, Kyushu University, Kukuoka, Japan

Hiroaki Nagano¹⁾, Katsuhiko Yanaga²⁾, Hiroshi Nishida³⁾, Koichi Kaneko⁴⁾, Ken Hoshino⁵⁾, Tadaaki Maehara⁶⁾, Munetaka Masuda⁷⁾, Hiroshi Matsufuji⁸⁾, Masato Nagino⁹⁾, Koichi Tabayashi¹⁰⁾, Ryuji Tominaga¹¹⁾