Wang, Ying-hui
Li, Gang http://orcid.org/0000-0003-4642-2033
Ma, Ruo-han
Zhao, Yan-ping
Zhang, Hao
Meng, Juan-hong
Mu, Chuang-chuang
Sun, Chong-ke
Ma, Xu-chen
Funding for this research was provided by:
National Natural Science Foundation of China (81671034)
Article History
Received: 5 May 2020
Accepted: 3 August 2020
First Online: 12 August 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in the study involving human participants were in accordance with the ethical standards of Institutional Review Board of Peking University School and Hospital of Stomatology and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Review Board of Peking University School and Hospital of Stomatology (PKUSSIRB-202054057).
: Written informed consent was not required for this study because all the included patients in the present investigation were collected retrospectively. Exemption of informed consent will not affect the rights and health of included patients. The application for free informed consent has been approved by the Institutional Review Board.