1 Division of Maternal Fetal Medicine, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Diego, La Jolla.
2 Neonatal-Perinatal Medicine Fellowship Program, Divisions of Neonatology and Palliative Medicine, Department of Pediatrics, University of California, San Diego/Rady Children's Hospital of San Diego, San Diego.
3 Division of Neonatology, Department of Pediatrics, University of California, San Diego/Rady Children's Hospital of San Diego, San Diego.