1. Division of Epidemic Intelligence Service, Center for Infectious Disease, National Institute of Health, Korea Centers for Disease Control and Prevention, Seoul, Korea.
2. Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Division of Infectious Diseases, Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
4. Division of Enteric Bacterial Infections, Centers for Infectious Disease, National Institute of Health, Korea Centers for Disease Control and Prevention, Seoul, Korea.
5. Division of Hepatitis Viruses, Centers for Infectious Disease, National Institute of Health, Korea Centers for Disease Control and Prevention, Seoul, Korea.
6. National Quarantine Station of Incheon Airport, Seoul, Korea.