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Calder A, Hegarty M, Erb TO, von Ungern-Sternberg BS.Calder A, et al.Paediatr Anaesth. 2012 Mar;22(3):239-43. doi: 10.1111/j.1460-9592.2011.03727.x. Epub 2011 Nov 8.Paediatr Anaesth. 2012.PMID: 22066487