- Correspondence to Dr Luoyan Ai, Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China; ; Dr Antao Xu, Department of Rheumatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China;
- Received March 11, 2020
- Revised December 27, 2020
- Accepted December 29, 2020
- First published January 13, 2021.
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