1. Division of Dermatology, National Center for Child Health and Development, Tokyo 157-8535, Japan
2. Division of Biostatistics, Department of Data Management, Center of Clinical Research and Development, National Center for Child Health and Development, Tokyo 157-8535, Japan
3. Division of Research and Development, Pigeon Corporation, Ibaraki 300-2495, Japan
4. Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo 157-8535, Japan
5. Allergy Center, National Center for Child Health and Development, Tokyo 157-8535, Japan