| Affiliation: | 1. Department of Prosthodontics, Asan Medical Center, College of Medicine, University of Ulsan, Pungnapdong 388‐1, 138‐736 Seoul, Korea;2. Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Yeungundong 28‐1, 110‐749 Seoul, Korea;3. Department of Orthodontics, School of Dentistry, Seoul National University, Yeungundong 28‐1, 110‐749 Seoul, Korea;4. Department of Prosthodontics, Samsung Medical Center, School of Medicine, Sungkyunkwan University, Ilwondong, 135‐710 Seoul, Korea |
