- Correspondence to Dr Yasumi Katayama, Department of Gastroenterology, Dokkyo Medical University Koshigaya Hospital 2-1-50 Minami-Koshigaya, Koshigaya City, Saitama Prefecture 343-8555, Japan;
- Received April 9, 2016
- Revised April 21, 2016
- Accepted April 25, 2016
- First published May 17, 2016.
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