- Correspondence to Professor Young-Suk Lim, Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Songpa-gu, Seoul 138-736, Korea;
- Received July 22, 2017
- Revised September 5, 2017
- Accepted September 26, 2017
- First published October 21, 2017.
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