Shin, WooSang
Yeom, Han-Gyeol
Lee, Ga Hyung
Yun, Jong Pil
Jeong, Seung Hyun
Lee, Jong Hyun
Kim, Hwi Kang
Kim, Bong Chul
Article History
Received: 24 December 2020
Accepted: 15 March 2021
First Online: 18 March 2021
Competing interests
: The authors declare no competing interests.
: Not applicable.
: This study was performed in accordance with the guidelines of the World Medical Association Helsinki Declaration for biomedical research involving human subjects and was approved by the Institutional Review Board of Daejeon Dental Hospital, Wonkwang University (W2002/002–001). Written or verbal informed consent was not obtained from any participants because the Institutional Review Board of Daejeon Dental Hospital, Wonkwang University waived the need for individual informed consent as this study had a non-interventional retrospective design and all data were analyzed anonymously.