1. Department of Neurosurgery, Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands
2. Academic Alliance for Skull Base Pathology, Maastricht and Radboud University Medical Centers, 6229 HX Maastricht, The Netherlands
3. Department of Otorhinolaryngology and Head & Neck Surgery, Radboudumc, 6525 GA Nijmegen, The Netherlands
4. Department of Otorhinolaryngology, Maastricht University Medical Center, 6525 GA Maastricht, The Netherlands