Funding for this research was provided by:
National Natural Science Foundation of China (31500759, 11432006, 31771449, 11672109)
Fundamental Research Funds for the Central Universities, SCUT (2017MS084, 2015ZY014)
Guangzhou Science and Technology Program (201707010062)
Received: 9 February 2018
Accepted: 8 May 2018
First Online: 22 January 2019
Ethics approval and consent to participate
: Not applicable.
: The authors declare no conflict of interests.
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