[1] Kinki Univ, Sch Med, Dept Gastroenterol & Hepatol, Osaka, Japan
[2] Chiba Univ, Grad Sch Med, Chiba, Japan
[3] Kyoundo Hosp, Tokyo, Japan
[4] Japanese Red Cross Musashino Hosp, Musashino, Tokyo, Japan
[5] Hiroshima Univ Hosp, Hiroshima, Japan
[6] Osaka Univ, Grad Sch Med, Osaka, Japan
[7] Kyoto Univ, Grad Sch Med, Kyoto, Japan
[8] Kumamoto Univ, Grad Sch Med Sci, Kumamoto, Japan
[9] Kawasaki Med Sch, Kurashiki, Okayama, Japan
[10] Ogaki Municipal Hosp, Ogaki, Japan
[11] Okayama Univ, Sch Med, Okayama, Japan
[12] Ikeda Municipal Hosp, Ikeda, Osaka, Japan
[13] Hiroshima City Hosp, Hiroshima, Japan
[14] Takamatsu Red Cross Hosp, Takamatsu, Kagawa, Japan
[15] Natl Canc Ctr, Tokyo, Japan
[16] Niigata Univ, Niigata, Japan