- 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 January 16, 2017
- Revised July 14, 2017
- Accepted August 21, 2017
- First published September 6, 2017.
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