1. School of Medicine, University of California, San Diego, California;
2. Department of Neurosurgery, University of Virginia Health System, Charlottesville, Virginia;
3. Department of Neurological Surgery, Cedars-Sinai Medical Center, Los Angeles, California;
4. Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases, New York, New York;
5. Université Aix-Marseille, Marseille, France;
6. Rocky Mountain Hospital for Children, Denver, Colorado; and
7. Departments of Orthopedic Surgery and
8. Neurological Surgery, University of California, San Francisco, California