Nian, Qixun
Ai, Lianfeng
Li, Dongmei
Chen, Xuelei
Zhang, Lei
Wang, Manman
Wang, Xuesheng
Funding for this research was provided by:
National Natural Science Foundation of China (21305028)
Training Foundation of North China University of Science and Technology (JQ201717)
Natural Science Foundation of Hebei Province (H2017209232)
Research Foundation of Education Bureau of Hebei Province (ZD2018014)
Article History
Received: 10 June 2018
Revised: 15 August 2018
Accepted: 17 August 2018
First Online: 28 August 2018
Compliance with ethical standards
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.
: The authors declare that they have no conflict of interest.