1. Department of Pediatric Neurosurgery, Hospital Santa Casa de Misericórdia, Porto Alegre, RS, Brazil
2. Department of Neurosurgery, Hospital de Pronto Socorro de Canoas, Canoas, RS, Brazil
3. Pediatric Neurosurgery Residency, Hospital Santa Casa de Misericórdia, Porto Alegre, RS, Brazil
4. Neurosurgery Residency, Hospital Ernesto Dornelles, Porto Alegre, RS, Brazil
5. Medical School, Hospital Universitário de Canoas, Universidade Luterana do Brasil, Canoas, RS, Brazil