Funding for this research was provided by:
Ningbo Municipal Bureau of Science and Technology (2016C05)
Received: 11 August 2020
Accepted: 4 January 2021
First Online: 13 January 2021
Ethics approval and consent to participate
: Ethical approval was granted by Yinzhou Center for Disease Control and Preventions’ Research Ethics Board, REC reference number 2016–11. Prior to participation, written informed consent was obtained from all participants and their legal guardians after a comprehensive explanation of the study.
: Not applicable.
: The authors declare that they have no competing interests.