1. Departments of Immunology and Molecular Microbiology, Seoul National University, Seoul, Korea
2. Department of Periodontology, Anam Hospital, Korea University, Seoul, Korea
3. Departments of Periodontology, BK21 CLS, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea
4. Department of Dentistry, College of Medicine, The Catholic University of Korea, Seoul, Korea