- Correspondence to Dr Zhonghui Guan, Anesthesia and Perioperative Care, University of California San Francisco, San Francisco, California, USA; ; Dr Liqiang Yang, Department of Pain Management, Xuanwu Hospital, Capital Medical University, Beijing, China;
- Received September 1, 2020
- Revision received November 19, 2020
- Accepted November 20, 2020
- First published December 16, 2020.
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