1. Division of Neurosurgery, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, 25123 Brescia, Italy
2. Rhoton Neurosurgery and Otolaryngology Surgical Anatomy Program, Mayo Clinic, Rochester, MN 55905, USA
3. Department of Neurologic Surgery, Mayo Clinic, Rochester, MN 55905, USA
4. Department of Neurosurgery and Gamma Knife Radiosurgery, I.R.C.C.S. San Raffaele Scientific Institute, Vita-Salute University, 20132 Milan, Italy
5. Neurosurgery Department, Hospital Italiano de Buenos Aires, Buenos Aires C1199, Argentina
6. Department of Neurologic Surgery, Mayo Clinic, Phoenix, AZ 85054, USA
7. Department of Ophthalmology, Mayo Clinic, Rochester, MN 55905, USA
8. Department of Otolaryngology/Head and Neck Surgery, Mayo Clinic, Rochester, MN 55905, USA
9. Department of Neurosurgery—Head and Neck Surgery, Azienda Ospedaliero-Universitaria Pisana, 56126 Pisa, Italy
10. Department of Otolaryngology—Head and Neck Surgery, Azienda Ospedaliero-Universitaria Pisana, 56126 Pisa, Italy