1. Department of Prosthodontics, Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
2. Department of Prosthodontics, College of Dentistry, Dankook University, Cheonan, Republic of Korea.
3. Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
4. Oral Cancer Center and Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital, Seoul, Republic of Korea.
5. Dental Research Institute and Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.