1. Pediatric Allergy and Infectious Diseases Society of Sapporo, Kumagai Pediatric Clinic, Sapporo, Japan.
2. Laboratory of Viral Infection I, Kitasato Institute for Life Sciences, Tokyo, Japan.
3. Kanonji Institute, The Research Foundation for Microbial Diseases of Osaka University, Kanonji, Kagawa, Japan.
4. The Osaka Institute of Public Health, Osaka, Japan.
5. Department of Pediatrics, Konan Kosei Hospital, Konan, Aichi, Japan.
6. The Society for Ambulatory and General Pediatrics of Japan, Tokyo, Japan.
7. Department of Pediatrics, Sapporo Medical University, Sapporo, Japan.
8. Department of Microbiology, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
9. Department of Pediatrics, National Hospital Organization Mie National Hospital, Tsu, Mie, Japan.