Li, Xiaotian
Zhang, Jianyun
Zhang, Heyu
Li, Tiejun
Article History
Received: 8 March 2021
Accepted: 5 May 2021
First Online: 17 May 2021
Declarations
:
: This research was approved by IRB of Peking University Hospital of Stomatology, and written informed consent was obtained from all patients (Approval No. PKUSSIRB-201418116a). All processes were in accordance with the ethical standards laid down in the 2008 Declaration of Helsinki and its later amendments.
: No applicable.
: The authors declare that they have no competing interests.