Funding for this research was provided by:
National Natural Science Foundation of China (61473302)
Natural Science Foundation of Hunan Province (Grant2019JJ20020)
Key Technologies Research and Development Program (2018YFC0910405)
National Natural Science Foundation of China (61772543)
Article History
Received: 9 April 2019
Revised: 2 July 2019
Accepted: 16 September 2019
First Online: 7 October 2019
Free to read: This content has been made available to all.