Tsushima, Fumihiko http://orcid.org/0000-0002-1919-746X
Sakurai, Jinkyo
Uesugi, Atsushi
Oikawa, Yu
Ohsako, Toshimitsu
Mochizuki, Yumi
Hirai, Hideaki
Kayamori, Kou
Harada, Hiroyuki
Article History
Received: 15 December 2020
Accepted: 3 June 2021
First Online: 10 June 2021
Declarations
:
: All procedures performed in studies were in accordance with the ethical standards of the institutional research committee (The ethics committee board of the faculty of dentistry of Tokyo Medical and Dental University, D2015-575) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The ethics committee board of the faculty of dentistry of Tokyo Medical and Dental University provided the authorization to analyze the data, due to the retrospective nature of the study. All data were anonymized before being used for the analysis. Informed consent: For this type of study, the need for formal consent was waived by the ethics committee board of the faculty of dentistry of Tokyo Medical and Dental University.
: Not applicable.
: The authors declare that they have no conflict of interest.