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Authors
Lu, Xingli https://orcid.org/0000-0002-5163-9088
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Funding
Funding for this research was provided by:
the scientific research fund for Ph.D. from the Ningxia University (ZR1724)
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Article History
Received: 6 August 2018
Accepted: 27 April 2019
First Online: 10 May 2019
Compliance with Ethical Standards
:
: The author declares that he has no conflict of interest.
