Funding for this research was provided by:
National Natural Science Foundation of China (81600508, 81770654)
Received: 30 May 2018
Accepted: 29 October 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the ethical review board of the First Affiliated Hospital of Sun Yat-Sen University, and written informed consent was obtained from all subjects.
: Not Applicable.
: The authors declare that they have no competing interests.