1. Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul, Korea.
2. Department of Oral and Maxillofacial Surgery and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
3. Tooth Bioengineering National Research Laboratory of Post BK21, School of Dentistry, Seoul National University, Seoul, Korea.
4. Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Korea.