1. Department of Medical Imaging, The Ottawa Hospital, University of Ottawa, and
2. Department of Radiology, First Affiliated Hospital, Dalian Medical University, Dalian, Liaoning, China; and
3. Department of Surgery, Division of Neurosurgery, University of Ottawa;
4. Department of Medical Imaging, University Health Network, University of Toronto, Ontario;
5. Service de Neuroradiologie Diagnostique et Thérapeutique, Hôpital Foch, Suresnes, France
6. Montreal Neurological Institute, Departments of Radiology, Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada;