^○Harutaka Kambayashi¹, Makoto Nishimura², Kenitirou Nakajima¹, Yasuko Ushio¹, Miho Matukawa², Kensuke Kuraoka¹, Mina Sasaki¹, Satoko Uegaki¹ (1.Dept. of Gastroenterology,Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan, 2.Dept. of endoscopy,Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan)

^○Hiroaki Shigoka, Sei Kimura, Shin Haruyama, Fumihiko Nakamura, Yoshinori Saigusa, Yosinori Matsuura, Ryota Higuchi, Hironori Kowazaki (Div. of Gastroenterology and Hepatology, Dept. of Internal Medicine, Kohsei Chuo General Hospital, Tokyo, Japan)

^○Norikatsu Numao, Jun Ushio, Kensuke Yokoyama, Hisashi Hatanaka, Tsuyoshi Tomiyama, Kiichi Tamada, Hironori Yamamoto (Dept. of Internal Medicine, Div. of Gastroenterology, Jichi Medical University, Shimotsuke, Japan)

^○Dai Sakuma, Masashi Sato, Norihiro Nomura, Junichi Eguchi, Keitarou Mitamura, Takayoshi Itou, Yoshio Deguchi, Masaaki Matsukawa, Haruhiro Inoue (Digestive Disease Center, Showa University Koto Toyosu Hospital, Tokyo, Japan)

^○Masashi Sato, Dai Sakuma, Norihiro Nomura, Junichi Eguchi, Keitarou Mitamura, Yoshio Deguchi, Takayoshi Itou, Masaaki Matsukawa, Haruhiro Inoue (Showa University Koto Toyosu Hospital, Tokyo, Japan)