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Response to letter to the editor.PainDworkin, R. H., O'Connor, A. B., Kent, J., Mackey, S. C., Raja, S. N., Stacey, B. R., Levy, R. M., Backonja, M., Baron, R., Harke, H., Loeser, J. D., Treede, R., Turk, D. C., Wells, C. D.2014; 155 (5): 1045-1046