Funding for this research was provided by:
National Natural Science Foundation of China (31672590)
National Key R&D Projects (2017YFD0501104)
Science and Technology Program of Guangzhou (201803020005)
Text and Data Mining valid from 2019-11-06
Received: 30 July 2019
Accepted: 3 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: Not applicable.
: All authors agreed the publication of this manuscript.
: The authors declare that they have no competing interests.