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Authors
Ma, Yankai
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Funding
Funding for this research was provided by:
South-Central University of Nationalities (YZZ16004)
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Article History
Received: 29 July 2019
Revised: 25 September 2019
Accepted: 2 October 2019
First Online: 21 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
