Received: 19 January 2021
Accepted: 26 July 2021
First Online: 10 August 2021
: This study has been performed in accordance with the Declaration of Helsinki. This study has been approved by the Ethics Committee of Children’s Hospital of Soochow University (No.2020CS033), and the informed consent from parents has been exempted. All data collected were stripped of patient identifiers, with no possibility to track the data to an individual person’s identity. The data in the study were obtained with the permission of the Children’s Hospital of Soochow University.
: Not applicable.
: The authors declare that they have no competing interests.