Funding for this research was provided by:
A Grant From Gansu Province (5007/382)
Science and Technology Service Network Initiative of Chinese Academy of Sciences (KFJ-EW-STS-143)
Key Research and Development Project of Gansu Province (18YF1NA051)
Article History
Received: 19 July 2019
Accepted: 4 October 2019
First Online: 18 October 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.