1. Division of Neurosurgery, Botucatu Medical School, São Paulo State University (UNESP), 18618-970 Botucatu, SP, Brazil
2. Departamento de Neurologia, Psiquiatria e Psicologia, (UNESP), Distrito de Rubião Júnior s/n, 18618-970 Botucatu, SP, Brazil
3. Hospital das Clínicas, São Paulo State University (UNESP), 18618-970 Botucatu, SP, Brazil