Funding for this research was provided by:
National Natural Science Foundation of China (61603176, 71732003)
Natural Science Foundation of Jiangsu Province (BK20160632)
Fundamental Research Funds for the Central Universities (14380037)
Young Scholar Support Programme of Nanjing University of Finance & Economics (L_YXW15101)
Article History
Received: 12 August 2019
Accepted: 24 February 2020
First Online: 6 March 2020