Funding for this research was provided by:
the National Natural Science Foundation of China (81572134)
Natural Science Foundation of Guangdong Province (2017A030311008, 2016A030313284, 2018A030313096)
the Fundamental Research Funds for the Central Universities (20ykpy94)
the Postdoctoral Science Foundation in Shaanxi Province of China (2017BSHQYXM ZZ15)
the China Postdoctoral Science Foundation (2019TQ0377)
the Guangdong Basic and Applied Basic Research Foundation (2019A1515110122)
Received: 28 July 2020
Accepted: 14 February 2021
First Online: 25 February 2021
Ethics approval and consent to participate
: The Research Ethics Committee of the Sun Yat-sen University approved this study. Written informed consent was obtained from each volunteer.
: Not applicable.
: The authors declare that they have no competing interests.