[1] Ehime Univ, Hlth Serv Ctr, 3 Bunkyo, Matsuyama, Ehime 7908577, Japan
[2] Ehime Univ, Grad Sch Med, Dept Gastroenterol & Metabol, Toon, Japan
[3] Ehime Univ, Dept Inflammatory Bowel Dis & Therapeut, Grad Sch Med, Toon, Japan
[4] Saiseikai Imabari Hosp, Dept Internal Med, Imabari, Japan
[5] Ehime Prefectural Cent Hosp, Dept Gastroenterol, Matsuyama, Japan
[6] Matsuyama Shimin Hosp, Dept Neurosurg, Matsuyama, Japan
[7] Sumitomo Besshi Hosp, Dept Gastroenterol, Niihama, Japan
[8] Ehime Prefectural Niihama Hosp, Dept Gastroenterol, Niihama, Japan
[9] Saiseikai Matsuyama Hosp, Dept Internal Med, Matsuyama, Japan
[10] OHASHI Clin Participate Gastro Enterol & Anoprocto, Niihama, Japan
[11] Ehime Univ Hosp, Endoscopy Ctr, Toon, Japan