Funding for this research was provided by:
Natural Science Foundation of China (31700977)
Directional Guidance Fund for the Capital Institute of Pediatrics (FX-2019-03)
Directional Guidance Fund for the Capital Institute of Pediatrics (FX-2017-09)
Beijing Municipal Science and Technology Commission (Z171100000417020)
Capital Health Research and Development of Special (2016-2-2103)
Article History
Received: 5 March 2020
Accepted: 26 May 2020
First Online: 6 June 2020
Ethics approval and consent to participate
: This study was approved by the Human Research Ethics Committee at the Capital Institute of Pediatrics (approval no.: SHERLL 2015023). Consent to participate was obtained from each patient. Written informed consent was obtained from the parents or guardians of all the patients
: Not applicable.
: The authors declare that they have no competing interests.