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Freeman LA, Young PM, Foley TA, Williamson EE, Bruce CJ, Greason KL.Freeman LA, et al. Among authors: williamson ee.AJR Am J Roentgenol. 2013 Jun;200(6):W581-92. doi: 10.2214/AJR.12.9531.AJR Am J Roentgenol. 2013.PMID: 23701088Review.