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Article History

Received: 22 May 2018

Accepted: 12 October 2018

First Online: 4 March 2019

Ethics approval and consent to participate

: The clinical study proposal was approved by the Ethical Committee of Jishuitang Hospital, and written consent was obtained from all patients.

: Written consent to publish images of patients was obtained from study participants, and was approved by the ethics committee.

: The authors declare that they have no competing interests.

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