Laboratorio Clínico de Enfermedades Neurodegenerativas, National Institute of Neurology and Neurosurgery (Instituto Nacional de Neurología y Neurocirugía), Mexico City, Mexico
Correspondence: Teresa Corona, MD, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, Ciudad de Mexico, Mexico, DF 14269 ([email protected]).
Potential conflicts of interest: none reported.
Received March 25, 2011
Accepted March 25, 2011
