Zhao, Sibo http://orcid.org/0000-0002-2828-5007
Funding for this research was provided by:
Social Science Foundation of Beijing (19SRC013)
Education and teaching reform fund in Central University of Finance and Economics (2018GRYBJG07)
Article History
First Online: 6 January 2020
Compliance with Ethical Standards
:
: The author declares that there is no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by the author.
: Informed consent was obtained from all individual participants included in the study.