Funding for this research was provided by:
National key research and development plan (2016YECD204103)
National Natural Science Foundation of China (U1610106)
The Excellent Youth Science and Technology Foundation of Province Shanxi of China (2014021007)
The 15th postgraduate science and technology project of North University of China (20181523)
2017 North University Science Research Fund Project (2017018)
Article History
Received: 10 January 2019
Accepted: 12 July 2019
First Online: 9 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.