1. Division of Neonatology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania;
2. Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
3. Biostatistics and Epidemiology Division, RTI International, Research Triangle Park, North Carolina;
4. Division of Neonatology, Duke University Medical Center, Duke University, Durham, North Carolina;
5. McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas;
6. Section of Neonatology, Nationwide Children’s Hospital, The Ohio State University, Columbus, Ohio;
7. Department of Pediatrics, University of Iowa, Iowa City, Iowa;
8. Biostatistics and Epidemiology Division, RTI International, Rockville, Maryland;
9. Warren Alpert Medical School, Brown University and Women & Infants Hospital of Rhode Island, Providence, Rhode Island;
10. Department of Pediatrics, School of Medicine, Stanford University, Stanford, California;
11. Lucile Packard Children’s Hospital, Palo Alto, California; and
12. Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Parkland Health & Hospital System, and Children’s Medical Center Dallas, Dallas, Texas