1. Department of Gynecology and Obstetrics; Division of Maternal Fetal Medicine; Johns Hopkins University School of Medicine; Baltimore MD USA
2. Integrated Research Center for Fetal Medicine; Johns Hopkins University School of Medicine; Baltimore MD USA
3. Department of Pediatrics; Division of Neonatal-Perinatal Medicine; Johns Hopkins University School of Medicine; Baltimore MD USA
4. Department of Obstetrics and Gynecology; CHA Bundang Medical Center; CHA University School of Medicine; Seongnam Korea
5. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore MD USA