[1] Chiba Canc Ctr, Dept Gastroenterol, Chuo Ku, Chiba 2608717, Japan
[2] Chiba Univ, Grad Sch Med, Dept Gastroenterol & Nephrol, Chiba, Japan
[3] Kameda Med Ctr, Dept Gastroenterol, Kamogawa, Japan
[4] Saitama Med Univ, Dept Hepatobiliary Pancreat Surg, Saitama Med Ctr, Kawagoe, Saitama, Japan
[5] Saitama Red Cross Hosp, Dept Gastroenterol, Saitama, Japan
[6] Kimitsu Chuo Hosp, Dept Gastroenterol, Kisarazu, Japan
[7] Asahi Gen Hosp, Dept Gastroenterol, Asahi, Japan
[8] Mito Saiseikai Gen Hosp, Dept Internal Med, Mito, Ibaraki, Japan
[9] Tokyo Womens Med Univ, Dept Gastroenterol, Yachiyo Med Ctr, Tokyo, Japan
[10] Numazu City Hosp, Dept Gastroenterol, Numazu, Japan