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Hagberg CA, Vogt-Harenkamp C, Kamal J.Hagberg CA, et al.J Clin Anesth. 2009 Aug;21(5):348-51. doi: 10.1016/j.jclinane.2008.09.009. Epub 2009 Aug 22.J Clin Anesth. 2009.PMID: 19700274