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Article History

Received: 8 May 2020

Accepted: 13 October 2020

First Online: 4 November 2020

Ethics approval and consent to participate

: Written and verbal informed consent to participate was obtained from the parent or legal guardian of the children and this study was approved by the Ethics committee of Affiliated Sixth People’s Hospital, Shanghai Jiao Tong University.

: Written informed consent for publication of their clinical details and clinical images were obtained from the parent or legal guardian of the children.

: The authors declare that they have no competing interests.