Funding for this research was provided by:
National Natural Science Foundation of China (81803334, 71774178, 71974212)
National Major Science and Technology Projects of China (2018ZX10715004)
Science and Technology Planning Project of Guangdong Province (2017A020212006)
Science and Technology Research Project of Guangzhou (201607010332, 201607010368)
Received: 12 June 2020
Accepted: 13 April 2021
First Online: 26 April 2021
: This study was reviewed by the ethics committee of School of Public Health, Sun Yat-sen university and considered exempt from full ethics review because it used an anonymized secondary routine dataset. The approval number is  065.
: Not applicable.
: The authors declare that they have no competing interest.