1. Department of Neurosurgery, Santa Casa Hospital; Ribeirão Preto, São Paulo, Brazil
2. Faculdade Atenas, Paracatu, Minas Gerais, Brazil
3. Department of Pathology, Universidade de São Paulo, Neurointensivism, Hospital Sírio Libanês, São Paulo, SP, Brazil
4. Department of Neurosurgery, Universidade de São Paulo, Neuro-oncology and Neurointensivism, Hospital Sírio Libanês, São Paulo, SP, Brazil
5. Department of Neurosurgery, Santa Casa Hospital, Ribeirão Preto, São Paulo, Brazil
6. Department of Neurosurgery of FBHC and Neurosurgery Service, Aracaju, Sergipe, Brazil