1 Department of Oral & Maxillofacial Surgery, Oral Science Research Institute, Yonsei University College of Dentistry, Seoul, Korea. Electronic address: cancer7@yuhs.ac.
2 Private Practice, Vienna VA; Former resident Harvard Oral & Maxillofacial Surgery, Boston, MA, USA. Electronic address: drsangkim@gmail.com.
3 Department of Oral & Maxillofacial Surgery, Oral Science Research Institute, Yonsei University College of Dentistry, Seoul, Korea. Electronic address: hspark709@yuhs.ac.
4 Department of Oral & Maxillofacial Surgery, Oral Science Research Institute, Yonsei University College of Dentistry, Seoul, Korea. Electronic address: ysjoms@yuhs.ac.