^○Tsutomu Tanaka¹, Masahiro Tajika¹, Makoto Ishihara¹, Nobumasa Mizuno², Kazuo Hara², Susumu Hijioka², Hiroshi Imaoka², Takamitsu Sato², Eiji Tsutsumi², Toshihisa Fujiyoshi², Tatsuji Yogi², Kenji Yamao², Yasumasa Niwa¹ (1.Dept. of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan, 2.Dept. of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan)

^○hirofumi fukushima¹, Hitoshi Sasaki², Hisashi Sato¹, Yuzuru Tajima¹, Tomoyoshi Shibuya¹, naoto sakamoto¹, Taro Osada¹, Mariko Hojo¹, takashi yoshizawa¹, akihito nagahara¹, Tatsuo Ogihara¹, sumio watanabe¹ (1.Dept. of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan, 2.JUNTENDO TOKYO KOTO GERIATRIC MEDICAL CENTER, Tokyo, Japan)

^○koji Fujita, Hideki Kobara, Shintaro Fujihara, Yasuhiso Goda, Taiga Chiyo, Tae Matsunaga, Noriko Nishiyama, Maki Ayaki, Tatsuo Yachida, Makoto Oryu, Hirohito Mori, Tsutomu Masaki (Dept. of Gastroenterology and Neurology, Sch. of Med. Kagawa Univ., Kagawa, Japan)

^○Sadafumi Azukisawa, Ken Kawaura, Kazu Hamada, Rika Itou, Hideyuki Okamura, Hidekazu Kitakata, Sachio Urashima, Tohru Itoh (Dept. of Gastroenterological Endoscopy, Sch. of Med. Kanazawa Medical Univ., Ishikawa, Japan)

^○Kentaro Yamashita¹, Yoshiaki Arimura¹, Kei Onodera¹, Toshiyuki Kubo¹, Kentaro Kawakami¹, Shinichi Kanno¹, Takao Endo² (1.Dept. of Gastroenterology, Sapporo Medical University, Sapporo, Japan, 2.Sapporo Shirakaba-dai Hospital, Sapporo, Japan)