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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (51775478)
Natural Science Foundation of Hebei Province (E2016203173)
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Article History
Received: 25 December 2019
Revised: 23 June 2020
Accepted: 17 July 2020
First Online: 31 August 2020
Competing interests
: The authors declare no competing financial interests.
