- Correspondence to Quanyi Wang, Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Prevention and Control (CDC), No.16 He Pingli Middle Street, Dongcheng District, Beijing 100013, China;
- Received May 23, 2020
- Revised July 21, 2020
- Accepted July 28, 2020
- First published August 27, 2020.
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