Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (No. 2018A030310201)
National Key R&D Program of China (No. 2018YFD0500600)
Text and Data Mining valid from 2018-10-22
Received: 26 May 2018
Accepted: 10 September 2018
First Online: 22 October 2018
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.