Wei, Wei
Guo, Zecheng
Xie, Binbin
Zhou, Junju
Li, Chuanhua
Funding for this research was provided by:
National Natural Science Foundation of China (41861040, 41761047)
Natural Science Foundation of Gansu Province (No.1506RJZA129)
Research Capability Improvement Program for Young Teachers of Northwest Normal University (No.SKQNYB14032)
Article History
Received: 17 September 2018
Accepted: 28 February 2019
First Online: 20 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.