Funding for this research was provided by:
National Natural Science Foundation of China (31660087, 31800423)
Natural Science Foundation of Guangxi Province (2018GXNSFBA281172)
Text and Data Mining valid from 2019-12-03
Received: 2 August 2019
Accepted: 12 November 2019
First Online: 3 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.