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Authors
Lei, Yu
Yao, Zhifeng
He, Dongjian
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Funding
Funding for this research was provided by:
The overall innovation project of science and technology of Shaanxi province
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Article History
Received: 21 September 2017
Accepted: 29 August 2018
First Online: 11 September 2018
Competing Interests
: The authors declare no competing interests.
