Nie, Yang
Yu, Xinle
Yang, Zhanxin
Funding for this research was provided by:
the Fundamental Research Funds for the Central Universities (3132017XNG17)
the Research program of science and technology at Universities of Inner Mongolia Autonomous Region (NJZY18232)
Research Fund for the Doctoral Program of Jining Normal University (jsbsjj1801)
Article History
Received: 29 June 2018
Accepted: 21 December 2018
First Online: 8 January 2019
Competing interests
: The authors declare that they have no competing interests.
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