1. Department of Pediatrics, Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
2. Department of Pediatrics, Division of Clinical Pharmacology and Therapeutics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
3. Department of Pediatrics, University of Virginia, Charlottesville, Virginia
4. Department of Pediatrics, University of Utah, Salt Lake City, Utah
5. Department of Pediatrics and Duke Clinical Research Institute, Duke University, Durham, North Carolina
6. Department of Pediatrics, University of Louisville, Louisville, Kentucky
7. KAI Research, Inc
8. Hospital for Children and Adolescents and Department of Clinical Pharmacology, University of Helsinki, Helsinki, Finland
9. Metrum Institute, Tariffville, Connecticut