- 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 16, 2015
- Revised April 28, 2015
- Accepted May 4, 2015
- First published May 22, 2015.
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