1. Department of Obstetrics and Gynecology; Stanford University School of Medicine; Stanford CA USA
2. Pediatrix Medical Group; San Jose CA USA
3. The Fetal and Pregnancy Health Program; Lucile Packard Children's Hospital Stanford; Palo Alto CA USA
4. Division of Neonatal and Developmental Medicine, Department of Pediatrics; Stanford University School of Medicine; Stanford CA USA
5. Department of Obstetrics and Gynecology; Loma Linda University School of Medicine; Loma Linda CA USA
6. Division of Neonatology, Department of Pediatrics; Loma Linda University School of Medicine; Loma Linda CA USA