1. Department of Virology III National Institute of Infectious Diseases Tokyo Japan
2. Global Specialized Laboratory for Measles and Rubella The World Health Organization Tokyo Japan
3. Department of Biochemistry and Cell Biology National Institute of Infectious Diseases Tokyo Japan
4. Osaka Institute of Public Health Osaka Japan
5. Aichi Prefectural Institute of Public Health Nagoya Japan
6. Toyama Institute of Health Toyama Japan
7. Department of Quality Assurance and Radiological Protection National Institute of Infectious Diseases Tokyo Japan