1. Department of Oral and Maxillofacial Surgery; Clinical Trial Center, Seoul National University Dental Hospital; Seoul Korea
2. Department of Oral and Maxillofacial Surgery; Korea University Medical Center, Guro Hospital; Seoul Korea
3. Department of Oral and Maxillofacial Surgery; Dongtan Sacred Heart Hospital, Hallym University Medical Center; Kyonggi-do Korea
4. Department of Oral and Maxillofacial Surgery; Kyunghee University Dental Hospital; Seoul Korea
5. Department of Material Science and Engineering; Seoul National University; Seoul Korea