- Correspondence to Dr. Kenta Hamada, Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan;
- Received November 16, 2017
- Revised December 4, 2017
- Accepted December 6, 2017
- First published December 19, 2017.
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