Funding for this research was provided by:
the Scientific Innovation Project of Guangdong Province, China (2017WTSCX096)
Guangdong Planning Office of Philosophy and Social Science (GD17CGL03)
Philosophy and Social Science 13th Five-Year Planning Project of Guangzhou, China (2017GZYB47)
National Natural Science Foundation of China (71802063, 71701054)
Article History
Received: 8 August 2018
Accepted: 20 February 2019
First Online: 28 February 2019