[1] Musashikosugi Hosp, Dept Gastrointestinal & Hepatobiliary Pancreat Su, Nippon Med Sch, 1-396 Kosugimachi, Kawasaki, Kanagawa 2118533, Japan
[2] Nippon Med Sch, Dept Gastrointestinal & Hepatobiliary Pancreat Su, Bunkyo Ku, 1-1-5 Sendagi, Tokyo 1138602, Japan
[3] Nippon Med Sch, Dept Emergency & Crit Care Med, Bunkyo Ku, 1-1-5 Sendagi, Tokyo 1138602, Japan