1. Field Epidemiology Training Program, National Institute of Infectious Diseases
2. Department of Acute Critical Care and Disaster Medicine, Tokyo Medical and Dental University
3. Infectious Diseases Surveillance Center, National Institute of Infectious Diseases
4. Infection Control Team, National Hospital Organization Mito Medical Center
5. Department of Infection Control and Laboratory Diagnostics, Internal Medicine, Tohoku University Graduate School of Medicine
6. Department of Bacteriology II, National Institute of Infectious Diseases
7. Department of Public Health and Welfare
8. Mito Public Health Center