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Authors
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Funding
Funding for this research was provided by:
Department of Education of Hebei Province (XM20151119230021355(BJ201605))
University of Science and Technology Beijing (2017-Z05)
Tangshan Science and Technology Bureau (17110223a)
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Article History
Received: 26 February 2020
Accepted: 4 January 2021
First Online: 12 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
