1 Rhoton Neurosurgery and Otolaryngology Surgical Anatomy Program, Mayo Clinic, Rochester, Minnesota, USA.
2 Department of Neurological Surgery, Mayo Clinic, Rochester, Minnesota, USA.
3 Medical School, University of Minnesota, Minneapolis, Minnesota, USA.
4 Division of Neurosurgery, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Brescia, Italy.
5 Department of Otolaryngology, Mayo Clinic, Rochester, Minnesota, USA.