Wang, Li
Wang, Xiaoqiang
Zhang, Qimin
Funding for this research was provided by:
Project supported by the National Natural Science Foundation of China (11661064)
Scientic Research Foundation of the Ningxia Higher Education Institutions of China (NGY2017033)
Article History
Received: 16 May 2018
Accepted: 15 November 2018
First Online: 29 November 2018
Competing interests
: The authors declare that they have no competing interests.