1. Division of Neonatology, Departments of Pediatrics and Obstetrics and Gynecology, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
2. Division of Biostatistics, Department of Pediatrics, Arkansas Children's Hospital, University of Arkansas for Medical Sciences, Little Rock, Arkansas
3. Division of Cardiology, Department of Pediatrics, Arkansas Children's Hospital, University of Arkansas for Medical Sciences, Little Rock, Arkansas
4. Division of Pediatric Cardiology, Department of Pediatrics, Emory School of Medicine, Children's Healthcare of Atlanta, Atlanta, Georgia
5. Division of Neonatology, Department of Pediatrics, Arkansas Children's Hospital, University of Arkansas for Medical Sciences, Little Rock, Arkansas