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Authors
Chen, Rui
Zhang, Shengfa https://orcid.org/0000-0001-7980-1326
Li, Jie
Guo, Dongwei
Zhang, Weijun
Wang, Xiaoying
Tian, Donghua
Qu, Zhiyong
Wang, Xiaohua
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Funding
Funding for this research was provided by:
Key Technologies Research and Development Program (2018YFB2101100)
Natural Science Foundation of Hebei Province (G2019202350)
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Article History
Received: 4 January 2021
Accepted: 2 March 2023
First Online: 22 March 2023
Declarations
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: The study complied with the Helsinki Declaration of 1975, revised in 2008. As a retrospective study aiming at improving people’s well being, the study was approved and the need for consent to participate was waived both by the School of Social Development and Public Policy of Beijing Normal University Ethics Committee (Protocol Number: SSDPP-HSC 2019004). All analyses were performed on routinely collected anonymized data from the participating institutions.
: Not applicable.
: The authors declare that they have no conflict of interest.
