^○Ryosuke Nakagawa, Yuji Inoue, Takeshi Oki, Hirotaka Kamikozuru, Yukinori Toyoshima, Masakazu Yamamoto (Dept. of Gastrienterological Surgery, Sch. of Med. Tokyo Women'S Medical Univ., Tokyo, Japan)

^○Keisuke Kawasaki^1,2, Tamotsu Sugai³, Takayuki Matsumoto¹ (1.Div. of Gastroenterology, Dept. of Internal Medicine, Iwate Medical University, Iwate, Japan, 2.Division of Gastroenterology, Matsuyama Red Cross Hospital, Ehime, Japan, 3.Division of Diagnostic Pathology, Iwate Medical University, Iwate, Japan)

^○Reina Nakamura, Takuma Okamura, Tomoaki Suga (Dept. of Gastroenterology Shinshu University Nagano Japan)

^○Kazuki Kato, Shinei Kudo, Atsushi Katagiri, Kunihiko Wakamura, Takemasa Hayashi, Toyoki Kudo, Hideyuki Miyachi, Masashi Misawa, Yuichi Mori, Tomoyuki Ishigaki, Tatsuya Sakurai, Makoto Kaga, Fumio Ishida (Digestive Disease Center,Showa University Northern Yokohama Hospital,Yokohama,Japan)

^○Masakatsu Fukuzawa^1,2, Takasi Kawai², Fuminori Moriyasu¹ (1.Dept. of Gastroenterology and Hepatology , Tokyo Medical University , Tokyo , Japan, 2.Endoscopy center , Tokyo Medical University hospital , Tokyo , Japan)