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