Text and Data Mining valid from 2019-07-02
Accepted: 14 March 2019
First Online: 2 July 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: The Human Subjects Ethics Sub-Committee of the Department of Sociology and Wuhan University approved this study. 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.
: Written informed consent was obtained by click a button from the participants before they completed the survey.