Funding for this research was provided by:
Science and Technology Department Foundation of Qinghai Province (2015-Z-Y02, 2016)
Qinghai Thousand Talents Program (724112)
State Key Laboratory of Wuhan University of Technology (2017-KF-4)
Article History
Received: 22 April 2019
Accepted: 27 May 2019
First Online: 11 June 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.