1. UPMC Children's Hospital of PittsburghUniversity of Pittsburgh Pittsburgh Pennsylvania
2. George Washington University Biostatistics Center Rockville Maryland
3. Baylor College of Medicine Houston Texas
4. University of Colorado Anschutz Medical Campus Aurora Colorado
5. University of Oklahoma Health Sciences Center Oklahoma City Oklahoma
6. Columbia University New York New York
7. Case Western Reserve University Cleveland Ohio
8. Massachusetts General Hospital Boston Massachusetts
9. Saint Louis University St. Louis Missouri
10. Children's Hospital of Philadelphia Philadelphia Pennsylvania