Corresponding Author

Department of Surgery, Shinshu University School of Medicine, Division of Gastroenterological, Hepato-Biliary-Pancreatic, Transplantation and Pediatric Surgery, Matsumoto, Japan

Correspondence

Makoto Koyama, Division of Gastroenterological, Hepato-Biliary-Pancreatic, Transplantation and Pediatric Surgery, Department of Surgery, University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.

Email: m_koyama@shinshu-u.ac.jp