Xu, Xiao-Han
Dong, Hang
Li, Li
Yang, Zhou
Lin, Guo-Zhen
Ou, Chun-Quan
Article History
Received: 27 March 2021
Accepted: 11 October 2021
First Online: 19 October 2021
Declarations
:
: The study proposal was approved by the Ethics Committee of Guangzhou Center for Disease Control and Prevention [GZCDC-ECHR-2020P0037]. The consent for participants was not required because the data used in this study were official death registration records. Moreover, daily number of deaths instead of individual data were analyzed in this study. All procedures were performed in accordance with relevant guidelines.
: Not applicable.
: The authors declare that they have no competing interests.