Funding for this research was provided by:
Scientific Startup foundation for Doctor of Northwest A&F University (Z109021715)
Student's Platform for Innovation and Entrepreneurship Training Program (201710712029)
Fundamental Research Funds for the Central Universities (Z109021606)
General Financial Grant from the China Postdoctoral Science Foundation (2017M623267)
National Science Foundation of China (31800599)
Article History
Received: 18 June 2018
Revised: 5 February 2019
Accepted: 1 April 2019
First Online: 21 May 2019
Compliance with ethical standards
:
: All the authors have declared no conflict of interest.