1. Department of Oral Medicine, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Korea.
2. Department of Oral Medicine, Dental and Life Science Institute, Pusan National University School of Dentistry, Yangsan, Korea.
3. Department of Microbiology & Immunology, Pusan National University School of Medicine, Yangsan, Korea.
4. Department of Oral Pathology, Pusan National University School of Dentistry, Yangsan, Korea.
5. Deptartment of Oral Medicine, Busan Paik Hospital, Inje University, Busan, Korea.