Funding for this research was provided by:
the National Natural Science Foundation of China (71874033)
Received: 15 June 2020
Accepted: 16 December 2020
First Online: 9 January 2021
Ethics approval and consent to participate
: The Health Services Survey is a regular survey organized by the government. The government releases the health service survey report to the public every five years. We participated in part of the Sixth Health Service Survey of Shanghai in 2018 and undertook the analysis of the health ecology of Shanghai. The retrospective analysis data used in this paper were owned by government departments. For data acquisition, readers can read the public report, or contact the Shanghai Health and Population and Family Planning Commission for data access.
: Not applicable.
: The authors declare that they have no competing interests.