1. Division of Epidemic Intelligence Service, Korea Centers for Disease Control and Prevention, Cheongju, Republic of Korea.
2. Division of Microbiology, Jeollanam-do Institute of Public Health and Environment, Gwangju, Republic of Korea.
3. Division of Microbiology, Incheon Research Institute of Public Health and Environment, Incheon, Republic of Korea.
4. Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health, Cheongju, Republic of Korea.