Li, Xingwei
Du, Jianguo
Long, Hongyu
Sun, Guili
Funding for this research was provided by:
The Special Funds of the National Social Science Fund of China (18VSJ038)
National Science Foundation of China (71471076)
Article History
Received: 3 July 2018
Accepted: 7 September 2018
First Online: 17 September 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.