- Correspondence to Youming Li and Professor Chaohui Yu, Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejiang, China; ,
- Received 16 January 2017
- Revised 14 July 2017
- Accepted 21 August 2017
- Published online 6 September 2017.
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