1. From the Neonatal Perinatal Research Institute, Division of Neonatology, Duke University Medical Center, Durham, NC (T.M.Y., M.L.K., R.L.); Institute of Molecular Medicine & Genetics (L.L., R.R.W.), Section of Pediatric Cardiology (L.L.), Medical College of Georgia, Augusta; and Department of Pediatric Cardiology, University of Münster, Münster, Germany (T.M.Y.).