1. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA;
2. Rhoton Neurosurgery and Otolaryngology Surgical Anatomy Program, Mayo Clinic, Rochester, Minnesota, USA;
3. Department of Neurosurgery and Gamma Knife Radiosurgery, I.R.C.C.S. San Raffaele Scientific Institute, Vita-Salute University, Milan, Italy;
4. Department of Neurosurgery, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina;
5. Medical Sciences Center, Federal University of Paraìba, Joao Pessoa, Brazil
6. Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, USA;