Funding for this research was provided by:
Pediatric Clinical Research Center Foundation of Sichuan Province, China (2017-46-4)
Article History
Received: 29 July 2020
Accepted: 12 April 2021
First Online: 21 April 2021
Declarations
:
: Ethical approval for this study was approved by the medical committee of West China Second Hospital, Sichuan University. Owing to the retrospective design of this research, informed consent was waived. No administrative permissions were acquired to access the data used in this study.
: Not applicable.
: The authors declare that they have no competing interests.