1) Department of Gastroenterology, Okayama University, Okayama, Japan
2) Department of Surgery, Kagawa Prefectural Central Hospital, Takamatsu, Japan
3) Department of Surgery, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan

Yoshitaka Kondo¹⁾, Naoaki Maeda¹⁾, Shinji Kuroda¹⁾, Daisuke Nobuoka²⁾, Sho Takeda¹⁾, Kunitoshi Shigeyasu¹⁾, Satoru Kikuchi¹⁾, Shuya Yano¹⁾, Shunsuke Tanabe¹⁾, Kazuhiro Noma¹⁾, Yuzo Umeda¹⁾, Fuminori Teraishi¹⁾, Shunsuke Kagawa¹⁾, Yasuhiro Shirakawa³⁾, Toshiyoshi Fujiwara¹⁾