Text and Data Mining valid from 2019-11-28
Received: 8 August 2019
Accepted: 5 November 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: This research was approved by the ethics committee of the Chaoyang Hospital Affiliated to Capital Medical University and agreed that participation was given to participants. Because of the retrospective nature of the study, informed consent was waived.
: Written informed consent for publication of their clinical details and/or clinical images was obtained from the patient/parent/guardian/relative of the patient.
: The authors declare that they have no competing interests.