1. Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, New York;
2. Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York;
3. Lenox Hill Hospital, Northwell Health, Department of Orthopaedics, New York, New York;
4. Department of Spine Surgery, Denver International Spine Clinic, Presbyterian St. Luke’s/Rocky Mountain Hospital for Children, Denver, Colorado;
5. Department of Orthopedics, SUNY Downstate Medical Center, Brooklyn, New York;
6. Division of Orthopaedic Surgery, Scripps Clinic, La Jolla, California;
7. Department of Orthopaedic Surgery, University of Calgary, Alberta, Canada;
8. Department of Orthopaedic Surgery, University of California, Davis, California;
9. Department of Orthopedic Surgery, Swedish Neuroscience Institute, Seattle, Washington;
10. Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas;
11. Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina;
12. Department of Neurosurgery, University of Virginia Medical Center, Charlottesville, Virginia; and
13. Department of Neurological Surgery, University of California, San Francisco, California