1 Division of Neurosurgery, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada.
2 Department of Neurosurgery, Tartu University Hospital, Neurology Clinic, University of Tartu, Tartu, Estonia.
3 Section of Neurosurgery, Health Sciences Centre, University of Manitoba, Winnipeg, Manitoba, Canada.
4 Division of Neurosurgery, Centre de Recherche du Centre Hospitalier Universitaire de Sherbrooke, University of Sherbrooke, Sherbrooke, Quebec, Canada.
5 Department of Neurosurgery, School of Medicine, University of Louisville, Louisville, Kentucky, USA.
6 Joint Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada.
7 Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.
8 Krembil Research Institute, Toronto, Ontario, Canada.