Xi, Qiang
Funding for this research was provided by:
National Natural Science Foundation of China (CN) (11601269)
National Natural Science Foundation of China (61503214)
Natural Science Foundation of Shandong Province (ZR2017MA048)
A Project of Shandong Province Higher Educational Science and Technology Program (J15LI02)
Article History
Received: 21 February 2018
Accepted: 24 July 2018
First Online: 6 August 2018
Ethics approval and consent to participate
: Not applicable.
: The author declares that there is no competing interest regarding the publication of this paper.
: Not applicable.