Funding for this research was provided by:
The Pediatric Medical Coordinated Development Center of Beijing Hospitals Authority (XTYB201808)
the Public Health Project for Residents in Beijing (Z151100003915103)
the National Key Research and Development Program of China (2016YFC0901505)
Received: 29 October 2020
Accepted: 30 March 2021
First Online: 7 April 2021
: The research protocol was approved by the ethics committee of Beijing Children’s Hospital, Capital Medical University, and written informed consent was received from all the patients and their parents before they participating in the study.
: Consent was obtained from all patients for publication.
: The authors declare that they have no competing interests.