Field Epidemiology Training Program, National Institute of Infectious Diseases, Japan
Community Medicine Section, Public Health and Welfare Bureau, City of Kyoto, Japan

Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Japan

Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Japan

Tokyo Metropolitan Research Laboratory and Public Health, Japan

Tokyo Metropolitan Research Laboratory and Public Health, Japan
Reimeikai-Minamidai Hospital, Japan