Funding for this research was provided by:
National Natural Science Foundation of China (71473059)
Received: 7 September 2020
Accepted: 5 April 2021
First Online: 8 November 2021
: “Not applicable,” the research is exempt from ethical approval because of secondary data utilization: Ministry of Health; Policy, Plan, Monitoring and Evaluation Directorate, ExternalRef removed
: Not applicable
: Authors declare that they have no competing interest in any part of the paper, including designing, results in interpretations, and policy implications.