1) Hepatobiliary and Pancreatic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
2) Specialized Surgeries, Tokyo Medical and Dental University, Tokyo, Japan
3) Gastrointestinal Surgery, Tokyo Medical and Dental University, Tokyo, Japan
4) Thoracic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
5) Cardiovascular Surgery, Tokyo Medical and Dental University, Tokyo, Japan
6) Trauma and Acute Critical Care Medical Center, Tokyo Medical and Dental University, Tokyo, Japan
7) Medical Education Research and Development, Tokyo Medical and Dental University, Tokyo, Japan

Keiichi Akahoshi¹⁾, Tsuyoshi Nakagawa²⁾, Shinichi Yamauchi³⁾, Kentaro Okamoto²⁾, Eriko Okada⁷⁾, Akira Endo⁶⁾, Masafumi Yashima⁵⁾, Hironori Ishibashi⁴⁾, Yusuke Kinugasa³⁾, Hiroyuki Uetake²⁾, Kenichi Okubo⁴⁾, Yasuhiro Otomo⁶⁾, Hirokuni Arai⁵⁾, Minoru Tanabe¹⁾