1. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Occupational Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Korean Armed Forces, Daegu Hospital, Daegu, Korea.
4. Department of Surgery, Kyunghee University College of Medicine, Seoul, Korea.
5. Department of Emergency Medicine, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Pathology, Hanyang University College of Medicine, Seoul, Korea.
7. Department of Microbiology, Gachon Medical School, Incheon, Korea.