1. Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama;
2. Department of Pediatrics, Wayne State University, Detroit, Michigan;
3. Department of Pediatrics, University of California, San Diego, San Diego, California;
4. Department of Pediatrics, Research Institute at Nationwide Children’s Hospital, Columbus, Ohio;
5. Department of Pediatrics, Duke University, Durham, North Carolina;
6. Department of Pediatrics, Case Western Reserve University, Cleveland, Ohio;
7. University of Texas at Houston McGowen Medical School, Houston, Texas; and
8. RTI International, Research Triangle Park, North Carolina