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Roberts JA, Roberts MS, Semark A, Udy AA, Kirkpatrick CM, Paterson DL, Roberts MJ, Kruger P, Lipman J.Roberts JA, et al.BMC Anesthesiol. 2011 Feb 20;11:3. doi: 10.1186/1471-2253-11-3.BMC Anesthesiol. 2011.PMID: 21333028Free PMC article.