- Correspondence to Dr Zhaoshen Li, Department of Gastroenterology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China; and Dr Xiangyu Kong, Department of Gastroenterology, Changhai Hospital, the Second Military Medical University, 168 Changhai Road, Shanghai 200433, China;
- Received 30 November 2017
- Accepted 7 December 2017
- Published online 11 January 2018.
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