Funding for this research was provided by:
National Natural Science Foundation of China (51802094)
Science and Technology Program of Hunan Province, China (2018RS3084)
Natural Science Foundation of Hunan Province (2018JJ3122)
Science Research Project of Hunan Provincial Department of Education (18B294)
Article History
Received: 6 August 2019
Accepted: 27 August 2019
First Online: 3 September 2019