Text and Data Mining valid from 2018-04-10
Received: 8 January 2018
Accepted: 28 March 2018
First Online: 10 April 2018
: Koichi Izumikawa, M.D., Tomoki Inaba, M.D., Shigenao Ishikawa, M.D., Ichiro Sakakihara, M.D., Kumiko Yamamoto, M.D., Sakuma Takahashi, M.D., Shigetomi Tanaka, M.D., and Masaki Wato, M.D.; Department of Gastroenterology, Kagawa Prefectural Central Hospital, 1–2-2 Asahi-machi, Takamatsu, Kagawa 760–8557, Japan. Masaya Iwamuro, M.D. and Hiroyuki Okada, M.D.; Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2–5-1 Shikata-cho, Kita-ku, Okayama, Okayama 700–8558, Japan. Kenji Kuwaki, M.D.; Department of Internal Medicine, Fukuyama City Hospital, 5–23-1 Zao-cho, Fukuyama, Hiroshima 721–8511, Japan.
: This study was reviewed and approved by the Ethical Committee of the Kagawa Prefectural Central Hospital, Takamatsu, Japan. This study is a retrospective study using medical records, and personal information protection measures are appropriately established so that informed consent of the subject was waived.
: Not applicable.
: The authors declare that they have no competing interests.
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