1. Department of Periodontology, College of Dentistry, Wonkwang University, Iksan 570-749, Korea.
2. Department of Microbiology, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.
3. Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
4. DOSIS M&M, Seoul 143-891, Korea.
5. Asia Pacific International School, Seoul 139-852, Korea.