- Correspondence to Ying Tang, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China; and Anping Xu, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China;
- Received July 6, 2020
- Revised September 9, 2020
- Accepted October 3, 2020
- First published October 21, 2020.
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