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Authors
Sang, Yanbin
Ren, Yan
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Funding
Funding for this research was provided by:
Natural Science Foundation of Shanxi Province (201601D011003)
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Article History
Received: 9 August 2018
Accepted: 25 February 2019
First Online: 8 March 2019
Competing interests
: The authors declare that they have no competing interests.
