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Authors
Hu, Y. D.
Li, W. Q.
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (11472239)
Natural Science Foundation of Hebei Province (A2015203023)
Hebei Provincial Graduate Innovation Fund of China (CXZZBS2018058)
Hebei Provincial Yanshan University Graduate Innovation Foundation of China (CXZS201908)
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Article History
Received: 18 July 2018
Accepted: 4 June 2019
First Online: 11 June 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
