Department of Gastroenterology;
Tsuyama Chuo Hospital;
Tsuyama;
Okayama 708-0841;
Japan;
2nd Department of Gastroenterology and Hepatology;
Okayama University Graduate School of Medicine;
Dentistry;
and Pharmaceutical Sciences;
Okayama 700-8558;
Japan;
Division of Endoscopy;
Okayama University Hospital;
Okayama 700-8558;
Japan;
Department of Gastroenterology and Hepatology;
Okayama University Graduate School of Medicine;
Dentistry;
and Pharmaceutical Sciences;
Okayama 700-8558;
Japan;