1. Clinical Research Support Center Tokyo Metropolitan Children's Medical Center Tokyo Japan
2. Division of Infectious Diseases Department of Pediatrics Tokyo Metropolitan Children's Medical Center Tokyo Japan
3. Infectious Disease Surveillance Center National Institute of Infectious Diseases Tokyo Japan
4. Department of General Pediatrics Aichi Children's Health and Medical Center Aichi Japan
5. Division of Infectious Diseases and Immunology Saitama Children's Medical Center Saitama Japan
6. Nursing Division Tokyo Metropolitan Children's Medical Center Tokyo Japan
7. Department of Pediatric Infectious Diseases Shizuoka Children's Hospital Shizuoka Japan