1. Division of Neonatology, Department of Pediatrics, Baylor University Medical Center and Pediatrix Medical Group, Dallas, Texas
2. Department of Quantitative Sciences, Baylor Scott & White Health Care System, Dallas, Texas
3. Department of Pharmacy, Baylor Hamilton Heart and Vascular Hospital, Dallas, Texas
4. Division of Neonatology, Department of Pediatrics, Feinberg School of Medicine, Northwestern University, and the Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
5. Center for Research, Education and Quality, MEDNAX Services–Pediatrix Medical Group, Sunrise, Florida