1. RegistrarDepartment of Anaesthesiology, Radboud University Medical CentreNijmegenNetherlands
2. ProfessorDepartment of Otorhinolaryngology and Head & Neck surgery, Radboud University Medical CentreNijmegenNetherlands
3. ConsultantDepartment of Neurosurgery, Radboud University Medical CentreNijmegenNetherlands
4. ConsultantDepartment of Anaesthesiology, Radboud University Medical CentreNijmegenNetherlands