Article History
Received: 7 December 2020
Accepted: 6 April 2021
First Online: 5 May 2021
Declarations
:
: This study was approved by the Biomedical Ethics Committee of Peking University School and Hospital of Stomatology (Protocol No: PKUSSIRB-201951178). The informed consent has been exempted. The administrative permissions have been obtained to access the CBCT images and collect the data used in this study.
: Not applicable.
: The authors declare that they have no competing interests.