Funding for this research was provided by:
shanghai municipal health commissio (GWV-10.2-YQ23 and GWV-10.1-XK14)
Article History
Received: 15 December 2020
Accepted: 28 October 2021
First Online: 11 November 2021
Declarations
:
: This study received approval from the ethics committee of the School of Public Health of Fudan University, China. All parents signed informed consent forms for their children to participate in the study.
: Not applicable.
: The authors declare no competing financial interests.