1. Division of Infectious Diseases, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
2. Division of Infectious Diseases, Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
3. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
4. Department of Infectious Diseases, Chonnam National University Medical School, Gwangju, Korea.
5. Division of Infectious Diseases, Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea.
6. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea.
7. Division of Infectious Disease, Chungnam National University Sejong Hospital, Sejong, Korea.
8. Department of Infectious Diseases, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
9. Department of Internal Medicine, Jeonbuk National University Medical School, Jeonju, Korea.
10. Division of Infectious Diseases, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
11. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
12. Division of Infectious Diseases, Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
13. Division of Infectious Disease, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
14. Division of Infectious Diseases, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
15. Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University College of Medicine, Jinju, Korea.
16. Division of Infectious Disease, Department of Internal Medicine, Seoul Medical Center, Seoul, Korea.
17. Division of Infectious Disease, Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea.
18. Department of Biostatistics, Korea University College of Medicine, Seoul, Korea.