1. Graduate Program in Medicine: Surgical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS); Neurotology and Acoustic Neuroma Center (CNNA); Clínica Lavinsky; Hospital Moinhos de Vento – Porto Alegre, Rio Grande do Sul, Brazil
2. The Advanced Neurology and Neurosurgery Research Center (CEANNE), Porto Alegre, Rio Grande do Sul, Brazil
3. Graduate Program in Medicine: Surgical Sciences, UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
4. Department of Neurology, Division of Neurosurgery, Universidade de São Paulo (USP), São Paulo, São Paulo, Brazil
5. Department of Neurosurgery, Eberhard Karls University, Tübingen, Germany
6. Hospital Moinhos de Vento, Porto Alegre, Rio Grande do Sul, Brazil
7. CNNA; Clínica Lavinsky, Porto Alegre, Rio Grande do Sul, Brazil