- Correspondence to Dr José Emilio Pablo-Gopar, Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez, Insurgentes Sur No. 3877, Colonia La Fama, DF 14269, Mexico;
- Published in print 1 December 2012.
- Published online 29 November 2012.
- Published first 22 May 2012.
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