1. Columbia University, New York, New York
2. University of California, San Diego, La Jolla
3. George Washington University Biostatistics Center, Washington, DC
4. University of Alabama at Birmingham
5. University of Texas Health Science Center at Houston–Children’s Memorial Hermann Hospital, Houston
6. Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
7. University of North Carolina at Chapel Hill, Chapel Hill
8. Brown University, Providence, Rhode Island
9. University of Utah Health Sciences Center, Salt Lake City
10. University of Texas Medical Branch, Galveston
11. Eastern Virginia Medical School, Norfolk
12. Ohio State University, Columbus
13. University of Colorado School of Medicine, Anschutz Medical Campus, Aurora
14. Duke University, Durham, North Carolina
15. Northwestern University, Chicago, Illinois
16. MetroHealth Medical Center-Case Western Reserve University, Cleveland, Ohio
17. Stanford University, Stanford, California
18. University of Texas at Austin