Funding for this research was provided by:
National Natural Science Foundation of China (61572225)
Natural Science Foundation of Jilin Province (20180101044JC)
Jilin Province Philosophy and Social Science Planning Fund Office (2019B68)
Education Department of Jilin Province (JJKH20180465KJ)
Jilin University of Finance and Economics (2018Z05)
First Online: 24 June 2020
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.