1. Division of Neurosurgery and Spine Program, University of Toronto, Toronto, Ontario, Canada.
2. Department of Neurological Surgery, University of California Davis School of Medicine, Sacramento, California.
3. Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland.
4. Vertex Pharmaceuticals Incorporated, Boston, Massachusetts.
5. BioAxone BioSciences, Inc, Cambridge, Massachusetts.
6. Department of Orthopaedic Surgery, Sidney Kimmel Medical Center at Thomas Jefferson University, Philadelphia, Pennsylvania.
7. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.