1. 1Department of Neurosurgery and the Alan L. and Jacqueline B. Stuart Spine Research Center, Lahey Hospital and Medical Center, Burlington, Massachusetts;
2. 2Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin;
3. 3Department of Neurosurgery, Caxias do Sul University, Rio Grande do Sul, Brazil;
4. 4Department of Neurosurgery, Brigham and Women’s Hospital, Boston, Massachusetts;
5. 5Department of Neurosurgery, Johns Hopkins University, Baltimore, Maryland;
6. 6Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan;
7. 7Department of Neurosurgery, University of Michigan, Ann Arbor, Michigan;
8. 8Department of Orthopaedic Surgery, University of California, San Francisco, California;
9. 9Lillian S. Wells Department of Neurosurgery, University of Florida, Gainesville, Florida;
10. 10Department of Neurosurgery, University of Utah, Salt Lake City, Utah;
11. 11Center for Spine Health, Department of Neurosurgery, Neurological Institute, Cleveland Clinic Foundation, Cleveland, Ohio;
12. 12Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin;
13. 13Department of Neurosurgery, University of California, San Francisco, California;
14. 14Department of Neurosurgery, University of Maryland, Baltimore, Maryland;
15. 15Department of Neurosurgery, University of Virginia Medical Center, Charlottesville, Virginia; and
16. 16Department of Neurosurgery, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, Arizona