Funding for this research was provided by:
National Social Science Foundation of China (20ZDA037)
National Natural Science Foundation of China (41930646)
National Natural Science Foundation of China (41971194)
National Natural Science Foundation of China (41971194)
Guangdong Province Introduction of Innovative R&D Team (No.2017ZT07X355)
Fundamental Research Funds for the Central Universities (19JNYH09)
Article History
Received: 5 March 2020
Accepted: 15 June 2020
First Online: 20 June 2020
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.