- Correspondence to Mrs Hongying Chen, Biological products management office, Hubei Provincial Center for Disease Control and Prevention, Wuhan, Hubei China; and Ping Hu, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China;
- Received October 11, 2018
- Revised May 14, 2019
- Accepted June 12, 2019
- First published July 12, 2019.
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