1 Neurology Department, Instituto Nacional de Neurología y Neurocirugía, Mexico City.
2 Neuromodulation and Brain Plasticity Unit, Health Sciences Research and Development Center, Universidad Autónoma de Nuevo León, Monterrey, Nuevo León.
3 Neurology Division, American British Cowdray Medical Center, Mexico City.
4 Neurodegenerative Diseases Clinical Laboratory, Instituto Nacional de Neurología y Neurocirugía, Mexico City.
5 Postgraduate Education Division, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico.