Funding for this research was provided by:
National Natural Science Foundation of China (41801306, 41871140)
Research Grants Council of the Hong Kong SAR, China (CityU11666716, CityU11612615)
Innovative Research and Development Team Introduction Program of Guangdong Province awarded (2017ZT07X355)
Text and Data Mining valid from 2019-07-25
Received: 21 April 2019
Accepted: 19 July 2019
First Online: 25 July 2019
Ethics approval and consent to participate
: Authorization of the study was consented by Sun Yat-Sen University Research ethics committee. All the subjects were informed and consented for the protocol of study.
: Consent forms are available upon reasonable request.
: The authors declare that they have no competing interests.