Funding for this research was provided by:
NSFC (61702558, 61602527)
Hunan Natural Science Foundation (2017JJ3411, 2017JJ3416)
Primary Research & Developement Plan of Hunan Province (2017WK2074)
National Key Research and Development Program of China (2017YFC0840104)
China Scholarship Council (201806375006)
Article History
Received: 18 May 2019
Accepted: 8 December 2019
First Online: 13 December 2019
Compliance with Ethical Standards
:
: The author declares that he has no conflict of interest.