^○Shinji Tanaka (Endoscopy and Medicine, Hiroshima University, Hiroshima, Japan)

^○Shunsuke Tsukamoto (National Cancer Center Hospital, Dept. of Colorectal Surgery , Japan)

^○Yoichi Ajioka (Div. of Molecular and Diagnostic Pathology Niigata University Graduate School of Medical and Dental Sciences, Japan)

^○Hiroaki Ikematsu¹, Yusuke Yoda¹, Yutaka Saito² (1.Dept. of Gastroenterology & Gastrointestinal Oncology, National Cancer Center Hospital East, Chiba, Japan, 2.Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan)

^○Yusuke Saitoh¹, Shiro Oka², Kenichi Sugihara³ (1.Digestive Disease Center, Asahikawa City Hospital, Asahikawa, Hokkaido, Japan, 2.Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan, 3.Department of Oncology and Colorectal Surgery, Tokyo Medical and Dental University, Tokyo, Japan)

^○Takashi Inoue¹, Hisao Fujii², Yoshiyuki Nakajima¹ (1.Dept. of Surgery, Nara Med. Univ., Kashihara, Japan, 2.Dept. of Endoscopy & Ultrasound, Nara Med. Univ., Kashihara, Japan)

^○Yohei Terakado¹, shin Ichihara², Akimichi Imamura¹ (1.Dept. of Gastroenterology, Sapporo Kosei General Hospital, Sapporo, Japan, 2.Dept. of Clinical Pathology, Sapporo Kosei General Hospital, Sapporo, Japan)

^○Yuta Kouyama, Shinei Kudo, Hideyuki Miyachi (Digestive Disease Center, Showa University Northern Yokohama Hospital, Japan)

^○Tatsuya Sakurai, Shinei Kudo, Takemasa Hayashi (Digestive Disease Center, Showa University, Northern Yokohama Hospital, Japan)

^○Shigehiko Fujii, Toshihiro Kusaka, Hiroyuki Kokuryu (Digestive Disease Center, Dept. of Gastroenterology, Kyoto Katsura Hospital., Japan)

^○Taku Tabata¹, Go Kuwata², Koichi Koizumi² (1.Dept. of Endoscopy, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan, 2.Department of Gastroenterology, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan)

^○Naoki Asama¹, Shinji Tanaka¹, Kazuaki Chayama² (1.Dept. of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan, 2.Department of Gastroenterology and Metabolism, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan)

^○Hirotaka Ishikawa, Akiko Chino, Masahiro Igarashi (Div. of Endoscopy, Cancer Institute Hospital of Jfcr, Tokyo, Japan)

^○Taku Sakamoto, Takahisa Matsuda, Yutaka Saito (Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan)

^○Shinji Yoshii¹, Masanori Nojima², Hiroyuki Tsukakoshi³ (1.Dept. of Gastroenterology, Sapporo Medical Center, NTT Ec, Sapporo, Japan, 2.The Institute of Medical Science Hospital, The University of Tokyo, Tokyo, Japan, 3.Department of Gastroenterology, Keiyukai Sapporo Hospital, Sapporo, Japan)

^○Toshiharu Sakurai, Hiroshi Kashida, Masatoshi Kudo (Dep. of Gastroenterology and Hepatology, Faculty of Med. Kinki Univ., Osaka, Japan)

^○Yasuteru Fujino, Tetsuo Kimura, Tetsuji Takayama (Dept. of Gastroenterology, Tokushima Univ. Hospital, Tokushima, Japan)