1. Department of Pharmacology and Therapeutics, McGillUniversity, 3655 Promenade Sir-William-Osler, Montreal, Quebec H3G 1Y6, Canada
2. Alan Edwards Centre for Research on Pain, McGillUniversity, Montreal, Quebec H3A 2B2, Canada
3. Institut Universitaire en Santé Mentale de Québec, Québec, QC G1J 2G3, Canada
4. Departments of Anatomy and Cell Biology, McGillUniversity, Montreal, Quebec H3A 2B2, Canada