- Correspondence to Dr Atsushi Masamune, Division of Gastroenterology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574 Japan;
- Received April 11, 2016
- Revised July 23, 2016
- Accepted July 26, 2016
- First published August 19, 2016.
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