Masaya Iwamuro a, b, ⁎ , Haruo Urata c, Masumi Furutani c, Yoshinari Kawai a, Hidenori Shiraha b, Akinobu Takaki b, Hiroyuki Okada d, Kazuhide Yamamoto b
a Department of Gastroenterology, Onomichi Municipal Hospital, 3-1170-177 Shintakayama, Onomichi 722-8503, Japan
b Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan
c Central Research Laboratory, Okayama University Medical School, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan
d Department of Endoscopy, Okayama University Hospital, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan