Funding for this research was provided by:
the Guangxi Natural Science Fund Project (2017GXNSFEA198003)
the Science and Technology Major Project of Guangxi (Guike AA17204064)
Article History
Received: 31 March 2020
Accepted: 18 May 2020
First Online: 5 June 2020
Compliance with ethical standards
:
: We state no conflict of interest with others.
: Our work complies with the ethical rules applicable for this journal.