Duan, Feng-feng http://orcid.org/0000-0002-8153-1211
Duan, Si-yao
Funding for this research was provided by:
the Base Project of Hunan Province Social Science (14JD38)
Article History
Received: 31 December 2017
Revised: 6 March 2018
Accepted: 2 April 2018
First Online: 10 April 2018