1 Allergy Center, National Center for Child Health and Development, Tokyo, Japan; Department of Pediatrics, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan.
2 Allergy Center, National Center for Child Health and Development, Tokyo, Japan.
3 Department of Pediatrics, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan.
4 Department of Emergency and Transport Medicine, National Center for Child Health and Development, Tokyo, Japan.
5 Division of Neonatology, Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo, Japan.
6 Allergy Center, National Center for Child Health and Development, Tokyo, Japan; Division of Eosinophilic Gastrointestinal Disorders, National Research Institute for Child Health and Development, Tokyo, Japan. Electronic address: nomura-i@ncchd.go.jp.