Funding for this research was provided by:
National Natural Science Foundation of China (61273367)
National Natural Science Foundation of China (71240015, 71402103)
Foundation for Distinguished Young Talents in Higher Education of Guangdong, China (2012WYM_0116)
MOE Youth Foundation Project of Humanities and Social Sciences at Universities in China (13YJC630123)
The Youth Foundation Project of Humanities and Social Sciences in Shenzhen University (14QNFC28)