1. Division of Infectious Diseases, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
2. Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Division of Infectious Diseases, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Division of Infectious Diseases, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Division of Infectious Diseases, Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
7. Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea.
9. Division of Infectious Diseases, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
10. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.