Funding for this research was provided by:
Natural Science Foundation of Jilin Engineering Normal University (XYB201814)
Fundamental Research Funds for Central Universities (2017B19714, 2017B07414)
Natural Science Foundation of Jiangsu Province (BK20180500)
Article History
Received: 26 September 2018
Accepted: 22 November 2018
First Online: 28 November 2018
Competing interests
: The authors declare that they have no competing interests.