Funding for this research was provided by:
Guangzhou Science and Technology Program key projects (201704030132, 202102080467)
Guangdong Medical Research Foundation (A2021124)
Received: 30 July 2021
Accepted: 21 December 2021
First Online: 28 December 2021
: Our study was approved by the Guangzhou Medical Ethics Committee of the Chinese Medical Association, and all participants provided written informed consent before participation in the GBCS. All methods in this study were performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.