1. Department of Neurological Surgery, University of California, San Francisco, California;
2. Brain and Spinal Injury Center, Zuckerberg San Francisco General Hospital, San Francisco, California;
3. Department of Neurologic Surgery, University of Michigan, Ann Arbor, Michigan;
4. Department of Neurological Surgery, University of Utah, Salt Lake City, Utah;
5. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota;
6. Department of Neurosurgery, University of Tennessee, Memphis, Tennessee;
7. Norton Leatherman Spine Center, Louisville, Kentucky;
8. Departments of Neurological Surgery and Orthopedic Surgery, Duke University, Durham, North Carolina;
9. Department of Neurological Surgery, Goodman Campbell Brain and Spine, Indianapolis, Indiana;
10. Department of Neurological Surgery, University of Virginia Health System, Charlottesville, Virginia;
11. Neuroscience Institute, Carolina Neurosurgery and Spine Associates, Carolinas HealthCare System, Charlotte, North Carolina;
12. Atlantic Neurosurgical Specialists, Morristown, New Jersey;
13. Department of Neurological Surgery, University of Miami, Florida;
14. Department of Neurological Surgery, Weill Cornell Medical Center, New York, New York;
15. Pacific Neurosciences Center, Torrance, California;
16. Atlanta Brain and Spine Care, Atlanta, Georgia; and
17. Geisinger Health, Danville, Pennsylvania