Funding for this research was provided by:
National Natural Science Foundation of China (81070472)
Science and Technology Planning Project of Guangdong Province (2012B031800121)
Received: 19 December 2019
Accepted: 10 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: The study was approved by Ethics Committee of the First Affiliated Hospital of Sun Yat-sen University, and the written consent was obtained from participants.
: Not applicable.
: The authors declare that they have no competing interest and nothing to disclose.