Funding for this research was provided by:
Bill & Melinda Gates Foundation (INV-016826)
Received: 25 September 2022
Accepted: 11 January 2023
First Online: 24 January 2023
: The study was approved by the institutional review board of the School of Public Health, Sun Yat-sen University (approval number: 2019–149).
: Not applicable.
: The authors declare that they have no competing interests.