1 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. Electronic address: [email protected].
2 Department of Gastroenterology, Mitoyo General Hospital, Kan-onji 769-1695, Japan.
3 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.