1. Department of Bacteriology, Toyama Institute of Health, Toyama
2. Department of Infectious Diseases, Osaka Prefectural Institute of Public Health, Osaka
3. Department of Bacteriology, Tokyo Metropolitan Institute of Public Health, Tokyo
4. Department of Microbiology, Fukushima Institute of Public Health, Fukushima
5. Department of Microbiology, Aichi Prefectural Institute of Public Health, Aichi
6. Morikawa Pediatric Clinic, Osaka
7. Department of Bacteriology, National Institute of Infectious Diseases, Tokyo, Japan