Wu, Congcong
He, Yichao
Funding for this research was provided by:
Scientific Research Project Program of Colleges and Universities in Hebei Province (ZD2016005)
Natural Science Foundation of Hebei Province (F2016403055)
Article History
First Online: 3 May 2019
Compliance with ethical standards
:
: All 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.