1. Neurosurgeon, Division of Neurosurgery, Universidade de São Paulo, São Paulo, SP, Brazil
2. Statistician, São Paulo, SP, Brazil
3. Supervisor, Division of Neurosurgery, Universidade de São Paulo, São Paulo, SP, Brazil
4. Full Professor, Chairman, Division of Neurosurgery, Universidade de São Paulo, São Paulo, SP, Brazil
5. Associate Professor, Division of Neurosurgery, Universidade de São Paulo, São Paulo, SP, Brazil