1 Department of Gastroenterology, Aichi Medical University, 1-1 Yazakokarimata, Nagakute, Aichi, Japan. tinoue-tag@umin.ac.jp.
2 Department of Gastroenterology, Aichi Medical University, 1-1 Yazakokarimata, Nagakute, Aichi, Japan. ibusuki.mayu.336@mail.aichi-med-u.ac.jp.
3 Center for Clinical Research and Advance Medicine, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga, Japan. hkutsumi@belle.shiga-med.ac.jp.