1. Department of Neurosurgery, Kochi Medical School, Kochi University
2. Department of Otorhinolaryngology, Kochi Medical School, Kochi University
3. São Paulo ENT Center, Complexo Hospitalar Edmundo Vasconcelos
4. Department of Neurosurgery, DFV NEURO
5. Department of Neurosurgery, Hospital Euryclides de Jesus Zerbini