1. Departments of Orthopaedic Surgery and
2. Department of Orthopaedic Surgery, The Alpert Medical School of Brown University, Providence, Rhode Island;
3. Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada;
4. Neurosurgery, The Johns Hopkins University, Baltimore, Maryland;
5. Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York;
6. University of California San Diego School of Medicine, San Diego, California;
7. Department of Neurosurgery, University of Virginia Health System, Charlottesville, Virginia;
8. Denver International Spine Center, Presbyterian St. Luke’s/Rocky Mountain Hospital for Children, Denver, Colorado; and
9. Department of Neurosurgery, University of California San Francisco School of Medicine, San Francisco, California