1. Neurology and Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada
2. Alan Edwards Centre for Research on Pain, McGill University, 740 Docteur Penfield Ave, Suite 3200, Montreal, QC H3A 0G1, Canada
3. Faculty of Dentistry, McGill University, Montreal, QC H3A 0C7, Canada