1. Department of Oral Medicine; School of Dentistry; Kyung Hee University; Seoul Korea
2. Department of Preventive and Society Dentistry; School of Dentistry; Kyung Hee University; Seoul Korea
3. Department of Oral and Maxillofacial Pathology; Research Center for Tooth and Periodontal Regeneration (MRC); School of Dentistry; Kyung Hee University; Seoul Korea
4. Department of Periodontology; School of Dentistry; Kyung Hee University; Seoul Korea