1. Division of Newborn Medicine, Carl R. Darnall Army Medical Center, Fort Hood, Texas
2. Department of Pediatrics, University of Rochester Medical Center, Rochester, New York
3. Department of Pediatrics, Dell Children's Medical Center, Austin, Texas
4. Department of Biostatistics, University of Florida, Jacksonville, Florida
5. Division of Neonatology, Boston Children's Hospital, Boston, Massachusetts
6. Division of Neonatology, The University of Utah, Salt Lake City, Utah
7. Division of Neonatology, Rush University Medical Center, Chicago, Illinois