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Layton KF, Thielen KR, Koch CA, Luetmer PH, Lane JI, Wald JT, Kallmes DF.Layton KF, et al. Among authors: thielen kr.AJNR Am J Neuroradiol. 2007 Apr;28(4):683-9.AJNR Am J Neuroradiol. 2007.PMID: 17416821Free PMC article.