Funding for this research was provided by:
National Natural Science Foundation of China (11771102)
Characteristic Innovation Project of Education Department of Guangdong Province (2015KTSCX034)
Zhujiang New Star (201506010056)
Guangdong Province Outstanding Young Teacher Training Plan (YQ2015050)
Natural Science Foundation of Guangdong Province (2015A030313574, 2017A030313397)
National Natural Science Foundation of China (U1501251)
Article History
Received: 30 May 2018
Accepted: 27 November 2018
First Online: 10 December 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.