1. Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan.
2. Japan Drug Information Institute in Pregnancy, National Center for Child Health and Development, Tokyo, Japan.
3. Department of Pediatrics, Teikyo University, Tokyo, Japan.
4. Division of Medicinal Safety Science, National Institute of Health Sciences, Kawasaki, Japan.
5. Department of Pediatrics, National Center for Child Health and Development, Tokyo, Japan.
6. Department of Pharmaceuticals, National Center for Child Health and Development, Tokyo, Japan.
7. Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo, Japan.
8. Division of Clinical Pharmacology and Toxicology, Hospital for Sick Children, Toronto, Ontario, Canada.