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Article History
Received: 5 July 2020
Accepted: 14 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Sichuan Provincial Orthopedics Hospital. Informed consent was waived due to the retrospective nature of this study.
: We had received verbal consent for guardians for publication of clinical details or information.
: The authors declare that they have no conflict of interest.
