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Authors
Zhang, Yong
Liu, Zifeng
Zhang, Lingling
Zhu, Paiyi
Wang, Xin
Huang, Yixiang http://orcid.org/0000-0003-3370-148X
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Funding
Funding for this research was provided by:
the National Social Science Fund of China (18BGL218)
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Article History
Received: 13 May 2019
Accepted: 22 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The CHARLS was approved by the Ethics Committee of Peking University Health Science Center. All participants gave written informed consent before recruited into the study.
: Not applicable.
: The authors declare that they have no competing interests.
