Funding for this research was provided by:
National Natural Science Foundation of China (71771032, 71501018)
National Social Science Foundation of China (17BJY188)
Ministry of Education in China Project of Humanities and Social Sciences (17YJC790168)
Soft Science Research Plan Project of Sichuan Province (2017ZR0205)
Construction Plan of Scientific Research and Innovation Team of Provincial Universities in Sichuan Province (18TD0016)
Article History
Received: 25 December 2017
Accepted: 10 May 2018
First Online: 2 July 2018