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Authors
Chen, Wei
Jiang, Manrui
Jiang, Cheng
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Funding
Funding for this research was provided by:
Beijing Social Science Fund (18YJB007)
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Article History
First Online: 4 May 2019
Compliance with ethical standards
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: The authors declare that there is no conflict of interest regarding the publication of this article.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent is obtained from all individual participants included in the study.
