1. Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, South Korea.
2. Department of Nanobiomedical Science and WCU Research Center, Dankook University, Cheonan, South Korea.
3. Biomaterials and Tissue Engineering, University College London Eastman Dental Institute, London, United Kingdom.
4. Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, South Korea.