Funding for this research was provided by:
National Natural Science Foundation of China (61703154)
Natural Science Foundation of Hunan Province (2017JJ2070)
Natural Science Foundation of Hunan Province (2019JJ60061)
China Postdoctoral Science Foundation (2016M602298)
Article History
Received: 11 March 2019
Accepted: 9 October 2019
First Online: 21 November 2019
Competing interests
: The authors declare that there is no conflict of interests regarding this manuscript.