Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (QL18009)
National Natural Science Foundation of China (71401192, 71371021)
National Natural Science Foundation of China (71873012, 71420107025)
Humanities and Social Sciences Planning Fund of Ministry of Education (17YJA790097)
Program for Innovation Research in Central University of Finance and Economics (011650317002)
Article History
Received: 12 October 2017
Accepted: 9 August 2019
First Online: 20 August 2019