1) Department of Digestive Disease Center, Totsuka Kyouritsu Dai-ichi Hospital, Yokohama, Japan
2) Department of Surgery, Division of Gastroenterological and General Surgery, Showa University School of Medicine, Tokyo, Japan

Tatsuya Yamazaki¹⁾²⁾, Noriyuki Murai¹⁾, Motohiko Fukushima¹⁾, Mitsunori Hoshino¹⁾, Tsutomu Kaetsu¹⁾, Nobuaki Matsui¹⁾²⁾, Masahiro Mieno¹⁾, Hikari Mifune¹⁾, Akiya Yokoyama¹⁾, Takeshi Aoki²⁾