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Authors
Wu, Qingjun https://orcid.org/0000-0003-0411-2758
Li, Zhen
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Funding
Funding for this research was provided by:
Support Program for Longyuan Youth and Fundamental Research Funds for the Universities of Gansu Province (14XNJ012)
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Article History
Received: 21 March 2019
Accepted: 5 June 2019
First Online: 23 July 2019
Competing interests
: The authors declare that they have no competing interests.
