1. Department of Pediatrics, National Hospital Organization Sagamihara National Hospital, Kanagawa, Japan
2. Department of Pediatrics, Jikei University School of Medicine, Tokyo, Japan
3. Department of Allergy, Clinical Research Center for Allergy and Rheumatology, National Hospital Organization Sagamihara National Hospital, Kanagawa, Japan
4. Division of Enzyme Chemistry, Institute for Enzyme Research, Tokushima University, Tokushima, Japan
5. Department of Pediatrics, Aiwa hospital, Saitama, Japan
6. Department of Pediatrics, National Hospital Organization Yokohama Medical Center, Kanagawa, Japan
7. Department of Pediatrics, National Hospital Organization Saitama Hospital, Saitama, Japan
8. Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Aichi, Japan
9. Department of Pediatrics, National Hospital Organization Beppu Medical Center, Oita, Japan
10. Department of Pediatrics, National Hospital Organization Fukuyama Medical Center, Hiroshima, Japan
11. Department of Pediatrics, National Hospital Organization Nagara Medical Center, Gifu, Japan
12. Department of Pediatric Medical Care, Gifu Prefectural General Medical Center, Gifu, Japan
13. Department of Pediatrics, Konan Medical Center, Hyogo, Japan
14. Department of Pediatrics, Saitama Medical Center Jichi Medical University, Saitama, Japan
15. Division of Molecular Epidemiology, Jikei University School of Medicine, Tokyo, Japan