Wang, Pingquan
Liu, Xun
Han, Zheng
Funding for this research was provided by:
Humanities and Social Sciences Fund of the Ministry of Educatio (19YJC630108)
Scientific Studies Program of Higher Education of Inner Mongolia Municipality (NJZY18181)
Article History
Received: 2 February 2020
Accepted: 6 April 2020
First Online: 18 April 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All authors have seen the manuscript and approved to submit to your journal. We confirm that the content of the manuscript has not been published or submitted for publication elsewhere.