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Coffeen U, López-Avila A, Ortega-Legaspi JM, del Angel R, López-Muñoz FJ, Pellicer F.Coffeen U, et al.Eur J Pain. 2008 Jul;12(5):535-43. doi: 10.1016/j.ejpain.2007.08.008. Epub 2007 Oct 23.Eur J Pain. 2008.PMID: 17936656