Shouko Ono 1, Kana Matsuda 2, Nobuyuki Ehira 3, Satoshi Abiko 4, Takeshi Mizushima 4, Keiko Yamamoto 5, Shinji Yoshii 6, Kazuhiro Takahashi 7, Mototsugu Kato 1, Naoya Sakamoto 4
1 Division of Endoscopy, Hokkaido University Hospital, Sapporo, Japan
2 Department of Internal Medicine and Gastroenterology, Abashiri-Kosei General Hospital, Abashiri, Japan
3 Department of Gastroenterology, Japanese Red Cross Kitami Hospital, Kitami, Japan
4 Department of Gastroenterology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
5 Department of Gastroenterology, Hakodate city Hospital, Hakodate, Japan
6 Department of Gastroenterology, Sapporo Medical center NTT EC, Sapporo, Japan
7 Department of Internal Medicine, Kushiro Rosai Hospital, Kushiro, Japan