Ito, Kotaro http://orcid.org/0000-0002-1177-8331
Muraoka, Hirotaka
Hirahara, Naohisa
Sawada, Eri
Okada, Shunya
Kaneda, Takashi
Article History
Received: 5 December 2020
Accepted: 8 February 2021
First Online: 21 February 2021
Compliance with ethical standards
:
: This study was approved by the Ethics Committee of the University School of Dentistry (No. EC15-12-009-1).
: The requirement to obtain written informed consent was waived for this retrospective study. All procedures followed the guidelines of the Declaration of Helsinki, Ethical Principles for Medical Research Involving Human Subjects.
: This article does not contain any studies with animal subjects performed by the any of the authors.