Funding for this research was provided by:
National Natural Science Foundation of China (11661009)
Guangxi Natural Science Fund for Distinguished Young Scholars (2015GXNSFGA139001)
Guangxi Natural Science Key Fund (2017GXNSFDA198046)
Article History
Received: 18 October 2018
Accepted: 24 July 2019
First Online: 16 August 2019