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Authors
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Funding
Funding for this research was provided by:
Natural Science Foundation of Hebei Province (F2017402142, E2018402092)
Department of Education of Hebei Province (ZD2017017)
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Article History
Received: 22 March 2019
Accepted: 19 August 2019
First Online: 11 September 2019
Compliance with ethical standards
:
: The authors declared that they have no conflict of interest to this work.
