1. Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
2. Department of Advanced Pediatric Medicine, Tohoku University School of Medicine, Tokyo 157-8535, Japan
3. Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8503, Japan
4. Department of Pediatrics, Perinatal and Maternal Medicine (Ibaraki), Graduate School, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
5. Institute director, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
6. Department of Pediatrics, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan