1. Department of Neurological Surgery, Columbia University Medical Center, New York, New York;
2. Rutgers New Jersey Medical School, Newark, New Jersey;
3. Department of Neurosurgery, University of Texas Southwestern Medical Center, Dallas, Texas;
4. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee;
5. Department of Pediatric Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah;
6. Department of Neurosurgery, University of Washington/Seattle Children's Hospital, Seattle, Washington;
7. Department of Neurosurgery, Yale University School of Medicine, New Haven, Connecticut;
8. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland;
9. Department of Pediatric Neurosurgery, Children's Hospital Colorado, University of Colorado Anschutz Medical Campus, Aurora, Colorado;
10. Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, Indiana;
11. Department of Neurosurgery, Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, Ohio;
12. Department of Pediatric Neurosurgery, Children's Wisconsin, Milwaukee, Wisconsin;
13. Department of Neurological Surgery, Washington University School of Medicine, St. Louis, Missouri;
14. Division of Pediatric Neurosurgery, Cincinnati Children's Hospital, Cincinnati, Ohio;
15. Division of Pediatric Neurosurgery, Connecticut Children's Hospital, Hartford, Connecticut;
16. Department of Pediatric Orthopedic Surgery, Shriners Hospital for Children, Philadelphia, Pennsylvania;
17. Department of Neurosurgery, Wake Forest School of Medicine, Winston-Salem, North Carolina;
18. Department of Neurosurgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts;
19. Department of Neurosurgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida;
20. Department of Neurosurgery, Division of Pediatric Neurosurgery, University of Alabama, Birmingham; and
21. Department of Neurosurgery, University of Pennsylvania/Children's Hospital of Philadelphia, Pennsylvania