[1] Fukushima Med Univ Hosp, Dept Endoscopy, Fukushima, Japan
[2] Fukushima Med Univ, Dept Gastroenterol, Fukushima, Japan
[3] Tohoku Univ, Div Gastroenterol, Grad Sch Med, Sendai, Miyagi, Japan
[4] Iwate Med Univ, Sch Med, Div Gastroenterol, Dept Internal Med, Morioka, Iwate, Japan
[5] Sendai City Med Ctr, Dept Gastroenterol, Sendai, Miyagi, Japan
[6] Fukushima Med Univ, Dept Minimally Invas Surg & Med Oncol, Fukushima, Japan
[7] Ohara Gen Hosp, Dept Gastroenterol, Fukushima, Japan
[8] Tohoku Med & Pharmaceut Univ, Div Gastroenterol, Sendai, Miyagi, Japan
[9] Iwate Prefectural Isawa Hosp, Dept Gastroenterol, Iwate, Japan
[10] Osaki Citizen Hosp, Dept Gastroenterol, Osaki, Japan
[11] Akita Univ, Dept Gastroenterol & Neurol, Grad Sch Med, Akita, Japan
[12] Yokote Municipal Hosp, Dept Gastroenterol, Yokote, Japan
[13] Miyagi Canc Ctr, Dept Gastroenterol, Natori, Miyagi, Japan
[14] Aomori Prefectural Cent Hosp, Div Endoscopy, Aomori, Japan
[15] Iwate Cent Prefectural Hosp, Dept Gastroenterol, Morioka, Japan
[16] Yamagata Univ, Dept Gastroenterol, Fac Med, Yamagata, Japan
[17] Noshiro Kosei Med Ctr, Div Gastroenterol, Noshiro, Akita, Japan
[18] Akita City Hosp, Dept Gastroenterol, Akita, Japan
[19] Akita Red Cross Hosp, Ctr Digest Dis, Akita, Japan
[20] Hiraka Gen Hosp, Aomori City Hosp, Div Gastroenterol, Japan Dept Gastroenterol, Aomori, Japan
[21] Natl Hosp Org, Dept Gastroenterol, Sendai Med Ctr, Sendai, Miyagi, Japan
[22] Iwate Prefectural Ninohe Hosp, Dept Gastroenterol, Ninohe, Japan
[23] Tohoku Rosai Hosp, Div Gastroenterol, Sendai, Miyagi, Japan
[24] Japanese Red Cross Morioka Hosp, Dept Gastroenterol, Morioka, Japan
[25] Hachinohe Red Cross Hosp, Dept Gastroenterol, Hachinohe, Aomori, Japan
[26] Iwate Prefectural Kuji Hosp, Dept Gastroenterol, Kuji, Japan
[27] Hirosaki Univ, Dept Gastroenterol & Hematol, Grad Sch Med, Hirosaki, Aomori, Japan
[28] Omagari Kosei Med Ctr, Dept Gastroenterol, Daisen, Japan
[29] Iwate Prefectural Ofunato Hosp, Dept Internal Med & Gastroenterol, Ofunato, Japan
[30] Iwate Prefectural Miyako Hosp, Dept Gastroenterol, Miyako, Japan
[31] Southern Tohoku Gen Hosp, Dept Gastroenterol, Sendai, Miyagi, Japan