1. Division of Bacterial Respiratory Infection, Center for Infectious Diseases, National Institute of Health, Centers for Disease Control and Prevention, Seoul 122-701, Republic of Korea
2. Korea Basic Science Institute, Seoul 136-701, Republic of Korea
3. Graduate School of Analytical Science and Technology, Chungnam University, Daejeon, 305-764, Republic of Korea
4. College of Medicine, Yonsei University, Seoul l20-749, Republic of Korea
5. Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Republic of Korea