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Article History

Received: 11 February 2021

Accepted: 6 August 2021

First Online: 17 August 2021

Declarations

:

: This study was approved in ethics Council of Children’s Hospital of Fudan University. Written permission was also obtained from the academic research office of Children’s Hospital of Fudan University before data collection. The consent for participation in the study was obtained from patient’s guardian at the first emergency visit.

: Not applicable.

: The authors declare that they have no competing interests and no potential conflicts of interest regarding the publication of this article.