Funding for this research was provided by:
Chengdu Municipal Commission of Health and Family Planning (0040205502002)
The National Key Research and Development Program of China (2017YFC0907303)
Received: 13 November 2019
Accepted: 28 June 2020
First Online: 8 July 2020
Ethics approval and consent to participate
: This survey was authorized by the Chengdu Municipal Health Commission (CMHC). And CMHC signed a consent document to authorize us to use the information of the survey and information in the database. All primary health centers signed consent documents to be included in this general survey. CMHC initiated this general survey and accessed these information (not including patients’ privacy) under the law of <Regulation on the Administration of Medical Institutions> of People’s Republic of China. CMHC was a certified institution to check ethics issues under the law of <Measures for the Ethical Review of Biomedical Research Involving Humans> of People’s Republic of China.
: Not applicable.
: The authors declare that they have no competing interests.