- Correspondence to Xiao-Ting Wu, Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, West China Hospital, Sichuan University, Chengdu 610041, China;
- Received February 4, 2020
- Revised February 10, 2020
- Accepted February 12, 2020
- First published February 28, 2020.
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