Funding for this research was provided by:
National Natural Science Foundation of China (61674113)
National Natural Science Foundation of China (51622507)
National Natural Science Foundation of China (61471255)
Natural Science Foundation of Shanxi Province (2016011040)
Scientific and Technologial Innovation Programs of Higher Education Institutions (2016138)
Article History
Received: 4 August 2018
Accepted: 31 October 2018
First Online: 8 November 2018