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McCrea M, Guskiewicz K, Randolph C, Barr WB, Hammeke TA, Marshall SW, Kelly JP.McCrea M, et al. Among authors: hammeke ta.Neurosurgery. 2009 Nov;65(5):876-82; discussion 882-3. doi: 10.1227/01.NEU.0000350155.89800.00.Neurosurgery. 2009.PMID: 19834399Clinical Trial.