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Article History

Received: 5 September 2018

Accepted: 12 November 2018

First Online: 20 November 2018

Ethics approval and consent to participate

: This study was approved by the Institutional Review Board of First Hospital of Hebei Medical University and received written consent from all the study participants.

: Written informed consent was obtained from each patients’ parents for the publication of this report and the accompanying images.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.