Funding for this research was provided by:
The National Natural Science Foundation of China (51672168, 51372148)
The Special Research Project of Shaanxi Provincial Education Department (17JK0019)
China Postdoctoral Science Foundation Funded Project (2017M623105)
The Science and Technology Project, Ankang (2017AYJC04)
The Scientific Research Fund for High Level Talents, Ankang University (2015AYQDZR01)
Article History
Received: 5 June 2018
Accepted: 14 August 2018
First Online: 23 August 2018