- Correspondence to Professor Xiong Ma, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Institute of Digestive Disease, 145 Middle Shandong Road, Shanghai 200001, China;
- Received October 31, 2016
- Revised January 28, 2017
- Accepted January 30, 2017
- First published February 17, 2017.
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