Che, Yang
Bo, Dingyi
Lin, Xiang
Chen, Tong
He, Tianfeng
Lin, Yi
Article History
Received: 25 March 2021
Accepted: 7 June 2021
First Online: 25 June 2021
Declarations
:
: The study was approved by the Research Ethics Committee of Ningbo Municipal Center for Disease Prevention and Control, China. All the participants read and signed the informed consent forms. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.