Funding for this research was provided by:
National Natural Science Foundation of China (81673198, 81803258)
Natural Science Foundation of Jiangsu Province (BK20161595)
Jiangsu Province’s Key Provincial Talents Program (QNRC2016563)
Received: 1 June 2020
Accepted: 7 January 2021
First Online: 3 February 2021
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Nanjiing Medical University. Written consent was obtained from the parents or guardians of all children.
: Not Applicable.
: The authors declare that they have no competing interests.