1. Department of Orofacial Pain and Oral Medicine, Kyung Hee University Dental Hospital, Kyung Hee University School of Dentistry, Seoul, Korea
2. Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University School of Dentistry, Seoul, Korea
3. Department of Biomedical Engineering, Kyung Hee University, Seoul, Korea