Wang, Pengcheng
Wang, Xingchao
Zhao, Meng
Wu, Yingqiu
Wang, Yuhui
Funding for this research was provided by:
the Key Research Institute in Humanities and Social Sciences of the Ministry of Education (14JJD190005)
the Key Project of Social Science Fund of Beijing, China (15SHA005)
Article History
First Online: 7 October 2017
Compliance with Ethical Standards
: 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.
: On behalf of all authors, the corresponding author states that there is no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.