1. Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University, Jeonju, Korea.
2. Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Jeonju, Korea.
3. Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.