Funding for this research was provided by:
National Natural Science Foundation of China (62076011)
Research foundation of Peking University School and hospital of Stomatology (PKUSS20200114)
Received: 12 January 2022
Accepted: 7 September 2022
First Online: 19 September 2022
: This retrospective study was approved by the bioethics committee of the Peking University School and Hospital of Stomatology (No. PKUSSIRB-202058135). Written informed consent was obtained from all participants.
: Participants gave written consent for their personal or clinical details along with identifying images to be published in this study.
: The authors declare no conflicts of interest, either directly or indirectly, in the information or products listed in the paper.