1. Department of Periodontology, Kyungpook National University School of Dentistry, Daegu 41940, Republic of Korea
2. Department of Prosthodontics, Kyungpook National University School of Dentistry, Daegu 41940, Republic of Korea
3. Department of Oral and Maxillofacial Surgery, Kyungpook National University School of Dentistry, Daegu 41940, Republic of Korea