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Authors
Zhang, Zhiqiang https://orcid.org/0000-0002-8736-8144
Yang, Xiangfeng
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Funding
Funding for this research was provided by:
Doctoral Fund of Shanxi Datong University (2016-B-03)
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Article History
First Online: 17 December 2018
Compliance with ethical standards
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: The authors declare that there is no conflict of interest regarding the publication of this paper.
: This article does not contain any studies with human participants or animals performed by any of the authors.
