Funding for this research was provided by:
Science and Technology Planning Project of Guangdong Province (2017A020215041)
National Natural Science Foundation of China (81400868)
Article History
Received: 31 August 2020
Accepted: 24 November 2020
First Online: 7 December 2020
Ethics approval and consent to participate
: This study was conducted in line with the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of Nanfang Hospital, Southern Medical University (NFEC-2020-187). The requirement for informed consent was waived because of the anonymous nature of the data.
: Not applicable.
: The authors declare that they have no competing interests.