1. Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec H3A 0C7, Canada
2. Faculty of Dentistry, McGill University, Montreal, Quebec H3A 0C7, Canada
3. Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, J5 68159, Germany
4. Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO, USA
5. Department of Neurology and Neurosurgery, Faculty of Medicine, McGill University, Montreal, Quebec H3A 0C7, Canada