Funding for this research was provided by:
National Natural Science Foundation of China (41930646, 41971194)
Guangdong Province Introduction of Innovative R&D Team (No.2017ZT07X355)
Fundamental Research Funds for the Central Universities (19JNYH09)
National Social Science Foundation of China (20ZDA037)
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.