1. Neurosurgery Department, Centro Avançado de Neurologia e Neurocirurgia (CEANNE), Porto Alegre, RS, Brazil
2. Otology and Otoneurology Department, The Center for advanced neurology and neurosurgery (CEANNE), Porto Alegre, RS, Brazil
3. Medicine department, University of North Georgia, Dahlonega, GA, USA.
4. Medicine department, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
5. Otology and Otoneurology Department, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil
6. Medicine department, Faculdade Evangélica Mackenzie do Paraná, Curitiba, PR, Brazil
7. Neurosurgery department, Universidade de São Paulo (USP), São Paulo, SP, Brazil.