1. Department of Obstetrics and Gynecology, Kyushu University Hospital; Kyushu University; Fukuoka Japan
2. Center of Maternal-Fetal, Neonatal and Reproductive Medicine; National Center for Child Health and Development; Tokyo Japan
3. Department of Fetal-Maternal Medicine; Nagara Medical Center; Gifu Japan
4. Maternal Fetal Medicine; Osaka Women's and Children's Hospital; Izumi Japan
5. Department of Pediatric Surgery; Osaka Women's and Children's Hospital; Izumi Japan