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Patil CG, Veeravagu A, Bower RS, Li G, Chang SD, Lim M, Adler JR Jr.Patil CG, et al. Among authors: chang sd.Neurosurg Focus. 2007;23(6):E9. doi: 10.3171/FOC-07/12/E9.Neurosurg Focus. 2007.PMID: 18081486Clinical Trial.