Liu, Zhengmin
Liu, Peide
Liang, Xia
Funding for this research was provided by:
National Natural Science Foundation of China (71771140)
Humanities and Social Sciences Research Project of Ministry of Education of China (17YJA630065)
Natural Science Foundation of Shandong Province (ZR2017MG007)
Science and Technology Project of Colleges and Universities of Shandong Province (J16LN25)
Special Funds of Taishan Scholars Project of Shandong Province (ts201511045)
Article History
Received: 12 October 2017
Revised: 28 December 2017
Accepted: 7 February 2018
First Online: 26 February 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.