Funding for this research was provided by:
National Natural Science Foundation of China (21878339, 21676302)
Hunan Provincial Innovation Foundation for Postgraduate (CX2018B036)
Natural Science Foundation of Hunan Province (2019JJ50791)
Article History
Received: 4 March 2019
Revised: 27 April 2019
Accepted: 3 May 2019
First Online: 16 May 2019
Compliance with Ethical Standards
:
: The authors have declared no conflict of interest.
: This work does not contain any studies with human participants or animals performed by any of the authors.