Affiliation: | Urara Nishida,Go Kamada,Takeshi Yoshida,Yuichi Shimizu,Masahiro Asaka,Department of Gastroenterology,Hokkaido University Graduate School of Medicine,Sapporo,060-8648,Japan Mototsugu Kato,Shouko Ono,Division of Endoscopy,Hokkaido University Hospital,Hokkaido,Japan Mutsumi Nishida,Department of Clinical Laboratory and Transfusion,Japan |