Funding for this research was provided by:
National Natural Science Foundation of China (31571432)
Hunan Provincial Natural Science Foundation of China (2015JC3097)
“Shennong” Scholar funding
Received: 27 September 2018
Accepted: 27 June 2019
First Online: 15 July 2019
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.
: The authors declare that they have no competing interests.