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Tummala RP, Ecker RD, Levy EI.Tummala RP, et al. Among authors: levy ei.J Neuroimaging. 2009 Jul;19(3):271-3. doi: 10.1111/j.1552-6569.2008.00283.x. Epub 2008 Aug 4.J Neuroimaging. 2009.PMID: 18681930
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Sauvageau E, Samuelson RM, Levy EI, Jeziorski AM, Mehta RA, Hopkins LN.Sauvageau E, et al. Among authors: levy ei.Neurosurgery. 2007 Apr;60(4):701-6; discussion 706. doi: 10.1227/01.NEU.0000255419.01302.66.Neurosurgery. 2007.PMID: 17325617Clinical Trial.