1. Department of Internal Medicine, Division of Infectious Diseases, Armed Forces Yangju Hospital, Yangju, Korea.
2. Department of Internal Medicine, Division of Infectious Diseases, Armed Forces Capital Hospital, Seongnam, Korea.
3. Department of Laboratory Medicine, Armed Forces Medical Research Institute, Daejeon, Korea.
4. Department of Public Health Administration and Operation, Armed Forces Medical Command, Seongnam, Korea.
5. Armed Forces Medical Command, Seongnam, Korea.
6. Department of Critical Care Medicine, Department of Internal Medicine, Armed Forces Capital Hospital, Seongnam, Korea.