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Authors
Zhao, Zihou
Huo, Lili
Wang, Lianying
Wang, Lijuan
Fu, Zuodi
Li, Yufeng
Wu, Xiaohong
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Funding
Funding for this research was provided by:
Beijing Natural Science Foundation (7172250)
National Natural Science Foundation of China (81261120566, 81970714)
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Article History
Received: 17 May 2019
Accepted: 28 October 2019
First Online: 9 November 2019
Ethics approval and consent to participate
: The study has been approved by the ethics committee at Pinggu Campus of Capital University Beijing Friendship Hospital. All participants provided written informed consent for their participation in the survey.
: Not applicable.
: The authors declare that they have no competing interests.
