Funding for this research was provided by:
National Science Foundation (18ZDA086)
Basic Scientific Research Operating Expenses of Central Universities (2018RCW007, 2018JBWB001)
Text and Data Mining valid from 2020-01-11
Received: 31 July 2019
Accepted: 3 January 2020
First Online: 11 January 2020
Ethical approval and consent to participate
: We provided information sheets about the study to all the participants and their guardians one week before the survey, the sheets highlighted that this survey was anonymous and the students were free to skip some questions and even quit the survey if they felt uncomfortable. Written informed consent was obtained from the guardians of all students. Verbal consent was obtained from the students before the examination. This study was reviewed and approved by the institutional review board of Beijing Jiaotong University of School of Economics and Management. Additional, students agree to participate and publication related study in the paper, and the consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare there are no conflicts of interest to report.