Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2015A030310506)
Guangdong Planning Office of Philosophy and Social Science (GD16XGL38)
Guangdong Planning Office of Philosophy and Social Science (2016GZQN32)
National Natural Science Foundation of China (71731010)
National Natural Science Foundation of China (71671048)
Article History
Received: 27 November 2017
Revised: 13 December 2017
Accepted: 21 December 2017
First Online: 16 January 2018