Funding for this research was provided by:
National Natural Science Foundation of China (81200619)
Guangdong Medical Research Foundation (A2020390)
Received: 30 June 2020
Accepted: 2 February 2021
First Online: 14 February 2021
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the First Affiliated Hospital Shantou University Medical College according to the Council for International Organizations of Medical Sciences. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.