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Chu LF, D'Arcy N, Brady C, Zamora AK, Young CA, Kim JE, Clemenson AM, Angst MS, Clark DJ.Chu LF, et al.Pain. 2012 Aug;153(8):1583-1592. doi: 10.1016/j.pain.2012.02.028. Epub 2012 Jun 16.Pain. 2012.PMID: 22704854Clinical Trial.