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Kahn I, Pascual-Leone A, Theoret H, Fregni F, Clark D, Wagner AD.Kahn I, et al.J Neurophysiol. 2005 Jul;94(1):688-98. doi: 10.1152/jn.01335.2004. Epub 2005 Mar 9.J Neurophysiol. 2005.PMID: 15758048Free article.