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Authors
Hu, Wenjun https://orcid.org/0000-0002-9535-1676
Zhang, Gang
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Funding
Funding for this research was provided by:
the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi province (2019L0940)
Natural Science Foundation of Shanxi Province (201901D211449)
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Article History
Received: 27 December 2019
Accepted: 24 May 2020
First Online: 3 June 2020
Competing interests
: The authors declare that they have no competing interests.
