J Korean Assoc Oral Maxillofac Surg 2017;43:16-22. https://doi.org/10.5125/jkaoms.2017.43.1.16
This correction is being published to correct the approval number of the Institutional Review Board in above article.
The authors apologize for this error.
Before correction
The study was approved by the Institutional Review Board of the Pusan National University Dental Hospital (PNUDH-2016-007).
After correction
The study was approved by the Institutional Review Board of the Pusan National University Dental Hospital (PNUDH-2016-015).