Funding for this research was provided by:
Basic research project of Qinghai Science and Technology Department (2016-ZJ-791)
International cooperation project of Qinghai Science and Technology Department (2015-HZ-809)
Text and Data Mining valid from 2018-03-31
Received: 5 August 2017
Accepted: 20 March 2018
First Online: 31 March 2018
Ethics approval and consent to participate
: No specific permits were required for this study. The study did not involve endangered or protected species.
: Not applicable.
: The authors declare that they have no competing interests.