[1] Natl Canc Ctr Hosp E, Dept Gastrointestinal Oncol & Endoscopy, Chiba 2778577, Japan
[2] Dokkyo Med Univ, Dept Radiol, Mibu, Tochigi, Japan
[3] Natl Canc Ctr, Div Endoscopy, Tokyo, Japan
[4] Natl Canc Ctr, Div Clin Lab, Tokyo, Japan
[5] Takahiro Fujii Clin, Tokyo, Japan