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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61871173)
Science and Technology Research Program of Higher Education in Hebei Province (QN2019123)
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Article History
Received: 22 May 2019
Revised: 22 July 2019
Accepted: 24 July 2019
First Online: 31 July 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
