Wei, Li https://orcid.org/0000-0001-6779-5010
Agarwal, Ravi P.
Funding for this research was provided by:
National Natural Science Foundation of China (11071053)
Natural Science Foundation of Hebei Province (A2014207010)
Key Project of Science and Research of Hebei Educational Department (ZD2016024)
Key Project of Science and Research of Hebei University of Economics and Business (2016KYZ07)
Youth Project of Science and Research of Hebei University of Economics and Business (2017KYQ09)
Youth Project of Science and Research of Hebei Educational Department (QN2017328)
Article History
Received: 4 June 2018
Accepted: 11 July 2018
First Online: 17 July 2018
Competing interests
: The authors declare that they have no competing interests.