1. The Center for Advanced Neurology and Neurosurgery (CEANNE), Brazil
2. Evangelical Mackenzie University of Paraná, Bigorrilho, Curitiba, PR, Brazil
3. The Center for Neurotology and Acoustic Neuroma (CNNA), Porto Alegre, Brazil
4. Lavinsky Clinic, Porto Alegre, Brazil
5. Department of Neurological Surgery, Laboratory of Surgical Innovations for Skull Base Microneurosurgery, Weill Cornell Medical College, New York, NY, USA
6. Department of Neurosurgery, University of São Paulo, São Paulo, SP, Brazil