1. Neurosurgery Resident, Neurology Departament, Universidade Estadual de Campinas (Unicamp), Campinas, SP, Brazil
2. Neurosurgery Assistant, Neurology Departament, Unicamp, Campinas, SP, Brazil
3. Professor of Pathology, Pathology Departament, Unicamp, Campinas, SP, Brazil
4. Professor of Neurosurgery, Neurology Departament, Unicamp, Campinas, SP, Brazil