Funding for this research was provided by:
the National Natural Science Foundation of China (31560027)
Guangxi Scholarship Fund of Guangxi Education Department
Guangxi Natural Science Foundation (2017GXNSFAA198297 and 2016GXNSFAA380247)
Bagui young Scholars” Special Project
Article History
Received: 9 June 2019
Accepted: 13 January 2020
First Online: 4 February 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.