| Affiliation: | 1. Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, ON, Canada;2. Department of Neurological Surgery, Thomas Jefferson University, Philadelphia, PA, USA;3. Department of Orthopaedic Surgery, Rothman Orthopaedic Institute, Thomas Jefferson University, Philadelphia, PA, USA;4. Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, USA;5. Department of Neurosurgery, Houston Methodist Hospital, Houston, TX, USA;6. Chicago, IL, USA |
