1. Division of Neurology, Faculty of Medicine, São Paulo State University (UNESP), 18618-970 Botucatu, SP, Brazil
2. Division of Neurosurgery, Faculty of Medicine, São Paulo State University (UNESP), 18618-970 Botucatu, SP, Brazil
3. Department of Pathology, Faculty of Medicine, São Paulo State University (UNESP), 18618-970 Botucatu, SP, Brazil