Funding for this research was provided by:
Natural Science Foundation of Fujian Province (2015J01012)
Funding of the Young Key Teachers Training Program of Zhengzhou Business University
Text and Data Mining valid from 2019-07-11
Received: 3 January 2019
Accepted: 20 June 2019
First Online: 11 July 2019
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
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