1. Division of Virology, Department of Microbiology and Immunology, Institute of Medical Science, University of Tokyo, Tokyo
2. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Saitama
3. Department of Infectious Diseases, Graduate School of Medicine, University of Tokyo, Tokyo
4. Yokohama City Institute of Health, Kanagawa
5. Department of Pediatrics, Kawasaki Municipal Hospital, Kanagawa
6. Department of Pediatrics, Keiyu Hospital, Kanagawa
7. Department of Biochemistry, University of Shizuoka, School of Pharmaceutical Sciences, and COE Program in the 21st Century, Shizuoka, Japan
8. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin