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Authors
Bai, Xue-Xiao
Zhang, Jie
Wei, Li
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Article History
Received: 5 February 2020
Accepted: 8 July 2020
First Online: 17 July 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Peking University Hospital of Stomatology. Permission was obtained to access the database used for this study. After data collection, the data used were de-identified .
: Not applicable.
: No competing interests exist in this manuscript.
