1. Research Unit for Neurological Diseases, Instituto Mexicano del Seguro Social, Mexico City, Mexico.
2. Department of Experimental Surgery, Proyecto Camina A.C., Mexico City, Mexico.
3. Department of Neurology, School of Veterinary Medicine, Universidad Autonoma del Estado de Mexico, Toluca, Mexico.
4. Department of Biochemistry, Instituto Nacional de Rehabilitación, Mexico City, Mexico.