1. Department of Dental Hygiene, School of Health Sciences, Dankook University, Cheonan, Republic of Korea
2. Department of Conservative Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
3. Department of Oral and Maxillofacial Pathology and Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea