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Smith A, Sadagopan N, Walsh B, Weber-Fox C.Smith A, et al.J Fluency Disord. 2010 Mar;35(1):1-18. doi: 10.1016/j.jfludis.2009.12.001. Epub 2009 Dec 22.J Fluency Disord. 2010.PMID: 20412979Free PMC article.