Li, Li
Hang, Dong
Dong, Han
Yuan-Yuan, Chen
Bo-Heng, Liang
Ze-Lin, Yan
Zhou, Yang
Chun-Quan, Ou
Peng-Zhe, Qin
Article History
Received: 9 December 2020
Accepted: 5 April 2021
First Online: 8 May 2021
Declarations
:
: Our study was performed in accordance with the guidelines outlined in the Declaration of Helsinki and approved by the Research Ethics Committee of Guangzhou CDC. Informed consent was waived by the Research Ethics Committee of Guangzhou CDC, since we analyzed the data anonymously.
: Not applicable.
: The authors have declared no conflicts of interest.