Zhang, Huiping
Wu, Lei
Cheng, Mingming
Funding for this research was provided by:
National Social Science Foundation of China (15BSH051)
Article History
Received: 3 November 2016
Accepted: 3 March 2018
First Online: 12 March 2018
Compliance with Ethical Standards
:
: The authors declare that there is no any conflict of interest.
: This study has been approved by the Ethics Committee of the National Survey Research Center at Renmin University of China
: Informed consent was obtained from all individual participants included in this study.