1. Pediatric Residency Program, Nationwide Children's Hospital, The Ohio State University, Columbus, Ohio
2. Department of Pediatrics, Nationwide Children's Hospital, The Ohio State University, Columbus, Ohio
3. The Heart Center, Department of Cardiology, Nationwide Children's Hospital, Columbus, Ohio
4. Department of Obstetrics and Gynecology, The Ohio State University, Columbus, Ohio
5. Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio
6. Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
7. Department of Neonatology, Texas Children's Newborn Center, Texas Children's Hospital, Houston, Texas