1. Department of Oral and Maxillofacial Surgery, Korea University Anam Hospital, Seoul, 02841, Republic of Korea
2. Department of Periodontics, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea
3. Department of Periodontics, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, 222, Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea