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Johnson JL, van Wijk K, Sabick M.Johnson JL, et al. Among authors: sabick m.Ultrasound Med Biol. 2014 Mar;40(3):513-20. doi: 10.1016/j.ultrasmedbio.2013.10.011. Epub 2014 Jan 10.Ultrasound Med Biol. 2014.PMID: 24412169Free article.