1. Division of Neurosurgery, Department of Clinical Neurosciences, University of Calgary Cumming School of Medicine, Calgary, Canada
2. Department of Community Health Sciences, University of Calgary Cumming School of Medicine, Calgary, Canada
3. The Hotchkiss Brain Institute, University of Calgary Cumming School of Medicine, Calgary, Canada
4. Division of Neurology, Department of Clinical Neurosciences, University of Calgary Cumming School of Medicine, Calgary, Canada
5. The O’Brien Institute for Public Health, University of Calgary Cumming School of Medicine, Calgary, Canada
6. Department of Medicine, University of Calgary Cumming School of Medicine, Calgary, Canada
7. Division of Neurosurgery, Department of Surgery, University of Arizona, Tucson, Arizona
8. Division of Neurosurgery, Department of Surgery, University of Alberta, Edmonton, Canada