Funding for this research was provided by:
National Natural Science Foundation of China (81900281)
National Basic Research Program of China (973 Program) (2017YFC1308105)
Postdoctoral Research Foundation of China (2018M630585)
Received: 6 November 2019
Accepted: 11 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: Study approval and ethical clearance was obtained from the Children’s Hospital of Nanjing Medical University. Written consent was obtained from the guardian of the child prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests