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Hitchens TK, Ye Q, Eytan DF, Janjic JM, Ahrens ET, Ho C.Hitchens TK, et al. Among authors: ahrens et.Magn Reson Med. 2011 Apr;65(4):1144-53. doi: 10.1002/mrm.22702. Epub 2011 Feb 8.Magn Reson Med. 2011.PMID: 21305593Free PMC article.