1. Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles;
2. University of California, San Diego, School of Medicine;
3. Norton Leatherman Spine Center, Louisville, Kentucky;
4. Department of Orthopaedic Surgery, Baylor Scoliosis Center, Plano, Texas;
5. Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases, New York, New York;
6. Rocky Mountain Hospital for Children, Denver, Colorado;
7. Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas;
8. Department of Neurological Surgery, University of California, San Francisco, California;
9. Department of Orthopaedic Surgery, Oregon Health & Science University, Portland, Oregon; and
10. Scripps Health, La Jolla;
11. Department of Neurosurgery, University of Virginia Health System, Charlottesville, Virginia