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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (No. 51871087)
Natural Science Foundation of Hebei Province (No. E2016202406)
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Article History
Received: 7 November 2019
Accepted: 20 January 2020
First Online: 1 February 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.
