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Watson A, El-Deredy W, Iannetti GD, Lloyd D, Tracey I, Vogt BA, Nadeau V, Jones AK.Watson A, et al. Among authors: lloyd d.Pain. 2009 Sep;145(1-2):24-30. doi: 10.1016/j.pain.2009.04.003. Epub 2009 Jun 11.Pain. 2009.PMID: 19523766Free PMC article.