[1] Osaka Univ, Grad Sch Med, Dept Gastroenterol & Hepatol, Suita, Osaka 5650871, Japan
[2] Natl Hosp Org Tokyo Med Ctr, Dept Gastroenterol, Shinjuku Ku, Tokyo, Japan
[3] Osaka Univ, Grad Sch Med, Dept Biomed Stat, Suita, Osaka 5650871, Japan
[4] Osaka Police Hosp, Dept Gastroenterol, Osaka, Japan
[5] Natl Hosp Org, Dept Gastroenterol, Osaka Natl Hosp, Suita, Osaka, Japan
[6] Kansai Rosai Hosp, Dept Gastroenterol, Amagasaki, Hyogo, Japan
[7] Toyonaka City Hosp, Dept Gastroenterol, Toyonaka, Osaka, Japan
[8] Itami City Hosp, Dept Gastroenterol, Itami, Hyogo, Japan
[9] Osaka Rosai Hosp, Dept Gastroenterol, Sakai, Osaka, Japan
[10] Ikeda Municipal Hosp, Dept Gastroenterol, Ikeda, Osaka, Japan
[11] Sakai Municipal Hosp, Dept Gastroenterol, Sakai, Osaka, Japan
[12] Minoh City Hosp, Dept Gastroenterol, Mino, Japan