Funding for this research was provided by:
National Natural Science Foundation of China (71073171)
Shanghai 3-Year Action Plan for Public Health System Construction (SCREENING STUDY GWIV-18)
Received: 22 February 2017
Accepted: 8 October 2018
First Online: 19 October 2018
Ethics approval and consent to participate
: This observation study analyzed existing data sources, which did not have any patient-identifiable information. This study did not involve the collection, use or transmittal of individually identifiable data, so institutional review board approval and consent to participate of patients was not required.
: Not applicable.
: The authors declare that they have no competing interests.
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