Funding for this research was provided by:
the Science and Technology Program of of Guangdong Province (2013B021800141)
Science and Technology Program of Guangzhou (2014Y2-00179)
Science and Technology Plan Project of International Cooperation of Guangdong Province (2016A050502011)
National Natural Science Foundation of China (81472525)
Natural Science Foundation of Shandong Province (BS2015YY020)
Received: 25 October 2017
Accepted: 26 February 2018
First Online: 17 April 2018
Ethics approval and consent to participate
: This study was approved by the Committees for Ethical Review of Research at Sun Yat-sen University.
: Not applicable.
: The authors declare that they have no competing interests.
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