An, Meijing
Chen, Tianjiao
Zhou, Qianling
Ma, Jun
Funding for this research was provided by:
Special research grant for non-profit public service of the Ministry of Health of China (201202010)
Article History
Received: 30 July 2020
Accepted: 3 September 2021
First Online: 30 September 2021
Declarations
:
: Approval was obtained from the Ethics Committee of Peking University. Written informed consent was obtained from all participating children and their parents before any assessment.
: Not applicable.
: The authors declare that they have no competing interests.