Feng, Chen
Yue, Yuan
Zhang, Qingfang
Funding for this research was provided by:
National Natural Science Foundation of China (31471074)
Beijing Social Science Fund (16YYA006)
Renmin University of China (18XNLG28)
Article History
Received: 21 December 2018
Accepted: 26 July 2019
First Online: 13 August 2019
Competing Interests
: The authors declare no competing interests.