Author(s) affiliations:Hideki Shibata1,2*, Toru Sato1, Hidetoshi Makita1, Toshihiro Fujioka1, Takeshi Aoki2, Masahiko Murakami2
1Department of surgery, Makita general hospital, 1-34-6, Omorikita, Ota, Tokyo, Japan
2Department of gastroenterological and general surgery, Showa university Hospital, 1-5-8, Hatanodai, Shinagawa, Tokyo, Japan