1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Division of Infectious Diseases, Department of Internal Medicine, National Medical Center, Seoul, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Infectious Diseases, Myongji Hospital, Goyang, Korea.
5. Department of Internal Medicine, Seoul Medical Center, Seoul, Korea.
6. Division of Infectious Diseases, Department of Internal Medicine, Armed Forces Capital Hospital, Seongnam, Korea.
7. Department of Internal Medicine, Gyeonggi Provincial Medical Center Ansung Hospital, Anseong, Korea.
8. Department of Infectious Diseases, Chonnam National University Medical School, Gwangju, Korea.
9. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju, Korea.
10. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
11. Division of Infectious Diseases, Department of Internal Medicine, Incheon Medical Center, Incheon, Korea.
12. Division of Infectious Diseases, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
13. Department of Pediatrics, National Medical Center, Seoul, Korea.