1. Brain Tumour Research Centre, Montreal Neurological Institute and Hospital, Department of Neurology and Neurosurgery, McGill University, 3801 University Street, Montreal, Quebec H3A 2B4, Canada.
2. Department of Engineering Physics, Polytechnique Montréal, CP 6079, Succursale Centre-Ville, Montreal, Quebec H3C 3A7, Canada.
3. Neuronavigation Unit, Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec H3A 2B4, Canada.
4. Medical Physics Unit, McGill University, 1650 Cedar Avenue, Montreal, Quebec H3G 1A4, Canada.
5. Division of Neuropathology, Department of Pathology, McGill University, Montreal, Quebec H3A 2B4, Canada.