Funding for this research was provided by:
the PhD Start-up Fund of Natural Science Foundation of Guangdong Province, China (2015A030310192)
the Ministry of Education in China Project of Humanities and Social Sciences (15YJC630072, 14YJC630160)
the Philosophy and Social Science Plan Project of Guangdong Province, China (GD17CGL03)
the National Natural Science Foundation of China (71502043)
Article History
Received: 17 November 2016
Accepted: 21 November 2017
First Online: 27 November 2017