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.