1. Division of Infectious Diseases, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
2. Department of Internal Medicine, Gyeonggi Provincial Medical Center, Ansung Hospital, Anseong, Korea.
3. Division of Infectious Disease, Department of Medicine, Seongnam Citizens Medical Center, Seongnam, Korea.
4. Department of Internal Medicine, Gyeonggi Provincial Medical Center, Icheon Hospital, Icheon, Korea.
5. Department of Surgery, Gyeonggi Provincial Medical Center, Uijeongbu Hospital, Uijeongbu, Korea.
6. Department of Internal Medicine, Gyeonggi Provincial Medical Center, Uijeongbu Hospital, Uijeongbu, Korea.
7. Department of Internal Medicine, Gyeonggi Provincial Medical Center, Pocheon Hospital, Pocheon, Korea.
8. Division of Infectious Disease, Department of Internal Medicine, Myongji Hospital, Goyang, Korea.
9. Department of Internal Medicine, Armed Forces Capital Hospital, Seongnam, Korea.
10. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
11. Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea.
12. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
13. Infectious Disease Control Center, Gyeonggi Provincial Government, Suwon, Korea.