1. Division of Infectious Diseases, Department of Internal Medicine, Korea University, College of Medicine, Seoul, Korea.
2. Research Institute of Emerging Infectious Diseases, Korea University, College of Medicine, Seoul, Korea.
3. Department of Preventive Medicine, Korea University, College of Medicine, Seoul, Korea.
4. Department of Microbiology, Korea University, College of Medicine, Seoul, Korea.
5. Korean Armed Forces Daegu Hospital, Daegu, Korea.