Funding for this research was provided by:
National Major Science and Technology Projects of China (2018ZX09739002-006)
Bill and Melinda Gates Foundation (OPP1176615)
Received: 9 December 2020
Accepted: 12 May 2021
First Online: 24 May 2021
: This study was reviewed and approved by the Institutional Review Board (IRB) of the Institutes of Biomedical Sciences, Fudan University. Written informed consent was obtained from the parent/guardian of each child.
: Not applicable.
: All authors reported no conflicts of interests.