[1] Hyogo Med Univ, Dept Internal Med, Div Gastroenterol & Hepatol, Kobe, Hyogo 6638501, Japan
[2] Hyogo Med Univ, Dept Flammatory Bowel Dis, Div Surg, Kobe, Hyogo 6638501, Japan
[3] Hyogo Med Univ, Dept Clin Epidemiol, Kobe, Hyogo 6638501, Japan
[4] Hyogo Med Univ, Ctr Clin Res & Educ, Kobe, Hyogo 6638501, Japan
[5] Hyogo Med Univ, Dept Internal Med, Div Gastroenterol & Hepatol, 1 1 Mukogawacho Nishino Miyashi, Kobe, Hyogo 6638501, Japan