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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (11672258)
Natural Science Foundation of Hebei Province (D2020203001)
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Article History
Received: 20 July 2020
Accepted: 26 September 2020
First Online: 22 October 2020
Compliance with ethical standards
:
: The authors declare no competing financial interests.
