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