The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Natural Science Foundation of China (grant numbers: 61572180, 61472467, 61471164, 61672011, 61602164), the Hunan Provincial Natural Science Foundation of China (grant numbers: 2016JJ2012, 2018JJ2024), and the Key Project of the Education Department of Hunan Province (grant number: 17A037).
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Natural Science Foundation of China (grant numbers: 61572180, 61472467, 61471164, 61672011, 61602164), the Hunan Provincial Natural Science Foundation of China (grant numbers: 2016JJ2012, 2018JJ2024), and the Key Project of the Education Department of Hunan Province (grant number: 17A037).