1. Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
2. BK21 PLUS Project, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
3. Department of Prosthodontics, Pusan National University Hospital, Pusan, Republic of Korea.