1. Department of Neurosurgery, Centro de Neurocirurgia das Américas, Rio de Janeiro, Rio de Janeiro, Brazil
2. Department of Neurosurgery, Public Servants Hospital, Rio de Janeiro, Rio de Janeiro, Brazil
3. Department of Neurosurgery, University of Ponta Grossa, Paraná, PR, Brazil
4. Department of Neurosurgery, Copa D'or Hospital, Rio de Janeiro, Rio de Janeiro, Brazil