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Jones NW, Raine-Fenning NJ, Bradley E, Bugg G.Jones NW, et al.Ultrasound Med Biol. 2011 Mar;37(3):364-75. doi: 10.1016/j.ultrasmedbio.2010.12.008. Epub 2011 Jan 26.Ultrasound Med Biol. 2011.PMID: 21276655