Qi, Yongjun
Gu, Junhua
Li, Weixun
Tian, Zepei
Zhang, Yajuan
Geng, Juanping
Funding for this research was provided by:
National Natural Science Foundation of China (61702157, 41804118)
Department of Education of Hebei Province (QN2018085)
Innovation Capacity Improvement Project of Hebei Province (199676146H)
Article History
First Online: 9 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.