1. Department of Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
2. Department of Otolaryngology, McGill University, Montréal, Québec, Canada
3. Department of Diagnostic Neuroradiology, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
4. Department of Neuropathology, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada