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Authors
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Funding
Funding for this research was provided by:
Natural Science Foundation of Hebei Province (E2017402037)
Hebei Normal University of Science and Technology (ZD2018012)
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Article History
Received: 2 April 2019
Revised: 7 January 2020
Accepted: 30 January 2020
First Online: 12 February 2020
Compliance with Ethical Standards
:
: The authors declare that there is no conflict of interests regarding the publication of this paper.
