Hanamoto, Hiroshi
Nakagawa, Hikaru
Niwa, Hitoshi
Article History
Received: 29 September 2020
Accepted: 21 January 2021
First Online: 3 February 2021
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Osaka University Graduate School of Dentistry (approval number: R1-E7, approved on June 13, 2019). The requirement for written informed consent was waived by the Ethics Committee of Osaka University Graduate School of Dentistry because of the retrospective nature of the study. Further, all methods performed in the study adhered to the tenets of Declaration of Helsinki, and the patient data were anonymized for the retrospective analysis.
: Not applicable.
: The authors have no competing interests.