1. Department of Periodontology, Periodontal‐Implant Clinical Research Institute, Kyung Hee University College of Dentistry Kyung Hee University Medical Center Seoul South Korea
2. Department of Oral and Maxillofacial Radiology Kyung Hee University College of Dentistry, Kyung Hee University Medical Center Seoul South Korea
3. Win Dental Clinic Seoul South Korea