1. Department of Dental Biomaterials and the Institute for Biomaterials and Implant, College of Dentistry, Wonkwang University
2. Department of Oral and Maxillofacial Surgery, College of Dentistry, Wonkwang University
3. Department of Periodontology, Dental Research Institute, School of Dentistry, Seoul National University
4. BK21 Plus Project, Oral Science Research Center, Department of Prosthodontics, Yonsei University College of Dentistry