1. Department of Periodontology, Pusan National University School of Dentistry, Yangsan, Korea.
2. Department of Biochemistry, Pusan National University School of Medicine, Yangsan, Korea.
3. Department of Pharmacology, Pusan National University School of Medicine, Yangsan, Korea.
4. Department of Microbiology and Immunology, Seoul National University School of Dentistry, Seoul, Korea.