1. Department of Neurosurgery; Medical School, Federal University of São Paulo; São Paulo; São Paulo; Brazil
2. Division of Neurosurgery; Medical School, Federal University of Goiás; Goiânia; Goiás; Brazil
3. Department of Neurosciences; Medical School, Pontifical Catholic University of Goiás; Goiânia; Goiás; Brazil
4. Goiânia Neurological Institute; Goiânia; Goiás; Brazil