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Lindley LC, Mark BA, Daniel Lee SY, Domino M, Song MK, Jacobson Vann J.Lindley LC, et al.J Pain Symptom Manage. 2013 Apr;45(4):701-11. doi: 10.1016/j.jpainsymman.2012.03.010. Epub 2012 Aug 24.J Pain Symptom Manage. 2013.PMID: 22921174Free PMC article.