1. Department of Pediatric Neurosurgery, Vila Da Serra Hospital, Nova Lima, Brazil
2. Department of Neurosurgery, João XXIII Hospital, FHEMIG, Belo Horizonte, Minas Gerais, Brazil
3. Department of Medicine, University Center of Belo Horizonte (UNI-BH), Minas Gerais, Brazil
4. Department of Medicine, Itaúna University, Minas Gerais, Brazil
5. Residents of Neurosurgery at Department of Pediatric Neurosurgery, Vila da Serra Hospital and Biocor Institute, Nova Lima, Brazil