1. School of Dentistry; Seoul National University; Seoul; Korea
2. Department of Prosthodontics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul; Korea
3. Department of Orthodontics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul; Korea
4. Department of Advanced Materials Engineering; Sejong University; Seoul; Korea
5. Pre-doctoral Prosthodontic Education; Harvard School of Dental Medicine; Boston; MA; USA
6. Department of Statistics; Korea University; Seoul; Korea