- Correspondence to Professor Changqing Yang, Division of Gastroenterology and Hepatology, Tongji Hospital, Tongji University School of Medicine, Shanghai, 389 XinCun Road, Shanghai 200065, China;
- Received September 29, 2014
- Revised October 24, 2014
- Accepted October 27, 2014
- First published November 14, 2014.
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