Pan, Jinghu
Li, Junfeng
Funding for this research was provided by:
National Nature Science Foundation of China (41661025)
Scientific Research Fund for the Provincial Universities of Gansu (2016A-001)
Article History
Received: 22 December 2016
Accepted: 22 November 2017
First Online: 4 December 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.