Kuang, Juhong
Yang, Youyuan
Funding for this research was provided by:
Natural Science Foundation of Guangdong Province, China ((No. 2014A030310334 and No. 2016A030313005))
Innovation Project of Department of Education of Guangdong Province, China ((No. 2015KTSCX147))
Article History
Received: 5 January 2018
Accepted: 22 May 2018
First Online: 30 May 2018
Competing interests
: The authors declare that they have no competing interests.