Funding for this research was provided by:
National Natural Science Foundation of China (51605058)
Chongqing Research Program of Basic Research and Frontier Technology (cstc2015jcyjBX0088)
Fundamental Research Funds for the Central Universities (106112016CDJCR021226)
Six talent peaks project in Jiangsu Province (2014-ZBZZ-006)
Article History
Received: 11 February 2017
Accepted: 14 January 2018
First Online: 28 February 2018