Funding for this research was provided by:
Seoul National University Dental Hospital (04 - 2016 – 0085)
Text and Data Mining valid from 2020-03-24
Received: 26 December 2019
Accepted: 12 March 2020
First Online: 24 March 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Seoul National University Dental Hospital (IRB142/10–18). Written informed consent was obtained from all subjects who participated in this study.
: Not applicable.
: The authors declare that they have no competing interests.