1. Departments of Preventive, School of Medicine, Konkuk University, Seoul, Korea
2. Laboratory Medicine, School of Medicine, Konkuk University, Seoul, Korea
3. Department of Laboratory Medicine, School of Medicine, Yonsei University, Seoul, Korea
4. Division of Epidemic Intelligence Service, Korea Centers for Disease Control & Prevention, Osong, Korea
5. Division of Statistics, Graduate School of Public Health, Korea University, Seoul, Korea