1. Department of Microbiology, National Institute of Health, Seoul, 122-701, Republic of Korea.
2. Present address: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 110-744, Republic of Korea.
3. Department of Laboratory Medicine, Kyung Hee University College of Medicine, Seoul, 130-702, Republic of Korea.
4. Department of Laboratory Medicine, College of Medicine, Dankook University, Cheonan, 330-715, Republic of Korea.
5. Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, 602-715, Republic of Korea.
6. Department of Laboratory Medicine, Inje University School of Medicine, Seoul, 100-032, Republic of Korea.
7. Department of Laboratory Medicine, University of Ulsan College of Medicine, Seoul, 138-736, Republic of Korea.
8. Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, 120-752, Republic of Korea.
9. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 110-744, Republic of Korea.
10. Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, 110-744, Republic of Korea.
11. Clinical Research Institute, Seoul National University Hospital, Seoul, 110-744, Republic of Korea.