- Correspondence to Dr Makoto Chuma, Department of Gastroenterology and Hepatology, Hokkaido University, Kita 15, Nishi 7, Kita-ku, Sapporo 060-8638, Japan;
- Received May 6, 2015
- Revised November 13, 2015
- Accepted November 20, 2015
- First published December 15, 2015.
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