1 Departments of Neurosurgery, State University of Ponta Grossa, Passos-MG, Brazil.
2 Department of Neurosurgery, University of Sao Paulo, Passos-MG, Brazil; Department of Neurosurgery, Atenas Medical School, Passos-MG, Brazil. Electronic address: nicollasrabelo@hotmail.com.
3 Atenas Medical School, Passos-MG, Brazil.
4 University Center of Espirito Santo-ES, Vitoria, Brazil.
5 Department of Neurosurgery, University of Sao Paulo, Passos-MG, Brazil.