1. Department of Pediatrics, Philadelphia, Pennsylvania
2. Department of Microbiology, Philadelphia, Pennsylvania
3. Department of Pediatrics, University of Pittsburgh and the Children’s Hospital of Pittsburgh of UPMC, Philadelphia, Pennsylvania
4. Department of Pediatrics, Carolinas Medical Center, Charlotte, North Carolina
5. Department of Pediatrics, University of Mississippi Medical Center, Jackson
6. Department of Pediatrics, Nationwide Children’s Hospital, The Ohio State University, Columbus
7. Cincinnati Children’s Hospital Medical Center and University of Cincinnati
8. Saint Peter’s University Hospital, New Brunswick, New Jersey
9. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas
10. Department of Epidemiology, University of Alabama at Birmingham, Philadelphia, Pennsylvania