1) Department of Gastroenterological Surgery, Nagoya University, Nagoya, Japan
2) Department of Surgery, School of Medicine, Keio University, Tokyo, Japan
3) Division of Thoracic & Thyroid Surgery, Tokyo Medical University, Tokyo, Japan
4) Department of Gastroenterological Surgery II, Hokkaido University, Sapporo, Japan
5) Department of Surgery and Science, Kyushu University, Fukuoka, Japan

Yasuhiro Kodera¹⁾, Hideki Takami¹⁾, Yuko Kitagawa²⁾, Norihiko Ikeda³⁾, Satoshi Hirano⁴⁾, Masaki Mori⁵⁾