Funding for this research was provided by:
National Planning Office of Philosophy and Social Science (19CSH010)
Received: 5 October 2019
Accepted: 5 October 2020
First Online: 28 October 2020
Ethics approval and consent to participate
: Ethical approval for this study was granted by Institutional Review Board of University Tsinghua of China. With the approval of the IRB, written informed consent was received from respondents.
: This manuscript does not contain any individual person’s data in any form.
: The views expressed in the submitted article are the authors’ own and not an official position of the institution or the funders.