1. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin;
2. Department of Neurosurgery, The University of Tennessee Health Science Center, Memphis, Tennessee;
3. Department of Neurosurgery, New York University School of Medicine, New York, New York;
4. Department of Neurosurgery, University of Wisconsin Medical School, Madison, Wisconsin;
5. Department of Neurosurgery, Henry Ford Health System, Detroit, Michigan;
6. American Board of Neurological Surgery, Rochester, Minnesota;
7. Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon;
8. Department of Neurosurgery, Tufts Medical Center, Boston, Massachusetts;
9. Department of Neurosurgery, Virginia Commonwealth University, Richmond, Virginia;
10. Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, Pennsylvania;
11. Department of Neurosurgery, Wake Forest Baptist Health, Winston-Salem, North Carolina;
12. Department of Neurological Surgery, University of Washington School of Medicine, Seattle, Washington;
13. Neuroscience Institute, Carolinas Healthcare System and Carolina Neurosurgery & Spine Associates, Charlotte, North Carolina;
14. Department of Neurosurgery, Rush University Medical Center, Chicago, Illinois;
15. Department of Neurosurgery, University of Kansas, Kansas City, Kansas;
16. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland;
17. Department of Neurosurgery, University at Buffalo, New York;
18. Department of Neurological Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio;
19. Department of Neurological Surgery, Columbia University Medical Center, New York, New York;
20. Department of Neurosurgery, Mayo Clinic, Rochester, Minnesota; and
21. Department of Neurosurgery, David Geffen School of Medicine at UCLA, Los Angeles, California