1. Division of Pediatric Infectious Diseases, Johns Hopkins University, Baltimore, Maryland;
2. Division of Biostatistics and Epidemiology, University of Massachusetts, Amherst, Massachusetts;
3. Division of Pediatric Infectious Diseases, University of Louisville, Louisville, Kentucky;
4. University of Pennsylvania, Philadelphia, Pennsylvania;
5. Division of Pediatric Infectious Diseases, Mayo Medical School, Rochester, Minnesota;
6. Division of Pediatric Infectious Diseases, University of Missouri-Kansas City, Kansas City, Missouri;
7. Division of Pediatric Infectious Diseases, Columbia University Medical Center, New York, New York;
8. Division of Neonatology, Duke University, Durham, North Carolina; and
9. Division of Pediatric Infectious Diseases, George Washington University, Washington, District of Columbia