Funding for this research was provided by:
National Natural Science Foundation of China (11771104)
Program for Chang Jiang Scholars and Innovative Research Team in University (IRT-16R16)
Innovation Research for the Postgraduates of Guangzhou University (No.2017GDJC-D05)
NSERC Discovery Grants from the Natural Sciences and Engineering Research Council of Canada
Article History
Received: 10 August 2018
Accepted: 31 January 2019
First Online: 12 February 2019
Competing interests
: The authors declare that they have no competing interests.