1. Department of Periodontology, Gangnam Severance Dental Hospital, Yonsei University College of Dentistry, Seoul, Korea.
2. Department of Orthodontics, Gangnam Severance Dental Hospital, Yonsei University College of Dentistry, Seoul, Korea.
3. Department of Conservative Dentistry, Gangnam Severance Dental Hospital, Yonsei University College of Dentistry, Seoul, Korea.
4. Department of Oral and Maxillofacial Surgery, Gangnam Severance Dental Hospital, Yonsei University College of Dentistry, Seoul, Korea.
5. Department of Periodontology, Institute of Oral Bioscience, Jeonbuk National University College of Dentistry, Jeonju, Korea.