1. Department of Diagnostic and Interventional Neuroradiology; University Hospital; Tübingen Germany
2. Department of Ophthalmology; Universiy Hospital; Tübingen Germany
3. Department of Neurology; University Hospital; Tübingen Germany
4. Department of Otorhinolaryngology; University Hospital; Tübingen Germany
5. Department of Otorhinolaryngology; University Hospital; Ulm Germany