1. Department of Radiology; Philipps-University; Marburg Germany
2. Department of Neuropathology; Philipps-University; Marburg Germany
3. Department of Otolaryngology; Head and Neck surgery; Philipps-University; Marburg Germany
4. University Institute of Diagnostic; Interventional and Pediatric Radiology, Inselspital; Bern University Hospital; Bern Switzerland