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Article History

Received: 15 June 2020

Accepted: 26 October 2020

First Online: 10 November 2020

Ethics approval and consent to participate

: This study was approved by the ethics committee of the First Hospital of Jilin University. All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration as well as its later amendments or comparable ethical standards. All data published here are under the consent for publication. All the children in the study were under the age of 16. Written informed consent was obtained from a parent or guardian on behalf of all individual participants.

: All data published here are under the consent for publication. Written informed consent was obtained from a parent or guardian on behalf of all individual participants.

: The authors declare that they have no conflict of interest.