1. Department of Prosthodontics, Oral Science Research Center, BK21 Plus Project, Yonsei University College of Dentistry, Seoul, Korea;
2. Division of Rheumatology, Department of Internal Medicine, Institute for Immunology and Immunological Disease, Yonsei University College of Medicine, Seoul, Korea;
3. Brain Korea 21 Project for Medical Science, Yonsei University, Seoul, Korea;
4. Severance Biomedical Institute, Yonsei University College of Medicine, Seoul, Korea