[1] Aichi Canc Ctr Hosp, Dept Gastroenterol, Nagoya, Aichi 4648681, Japan
[2] Aichi Canc Ctr Hosp, Dept Endoscopy, Nagoya, Aichi 4648681, Japan
[3] Inst Liver & Biliary Sci, Dept Med Hepatol, Delhi, India
[4] Aichi Canc Ctr Hosp, Dept Gastrointestinal Surg, Nagoya, Aichi 4648681, Japan
[5] Nagoya Univ, Grad Sch Med, Dept Gastroenterol, Nagoya, Aichi 4648601, Japan