Ma, Nana
Gao, Rong
Wang, Xiaobin
Li, Ping
Funding for this research was provided by:
National Natural Science Foundation of China (61702389)
Yanta Scholars Foundation of Xian University of Finance and Economics
Social Science Foundation of Hebei Province (HB18GL036)
Article History
First Online: 13 February 2019
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.